st.c

   1 /* See LICENSE for licence details. */
   2 #include <ctype.h>
   3 #include <errno.h>
   4 #include <fcntl.h>
   5 #include <limits.h>
   6 #include <locale.h>
   7 #include <pwd.h>
   8 #include <stdarg.h>
   9 #include <stdbool.h>
  10 #include <stdio.h>
  11 #include <stdlib.h>
  12 #include <string.h>
  13 #include <signal.h>
  14 #include <stdint.h>
  15 #include <sys/ioctl.h>
  16 #include <sys/select.h>
  17 #include <sys/stat.h>
  18 #include <sys/time.h>
  19 #include <sys/types.h>
  20 #include <sys/wait.h>
  21 #include <time.h>
  22 #include <unistd.h>
  23 #include <libgen.h>
  24 #include <X11/Xatom.h>
  25 #include <X11/Xlib.h>
  26 #include <X11/Xutil.h>
  27 #include <X11/cursorfont.h>
  28 #include <X11/keysym.h>
  29 #include <X11/Xft/Xft.h>
  30 #include <fontconfig/fontconfig.h>
  31 #include <wchar.h>
  32
  33 #include "arg.h"
  34
  35 char *argv0;
  36
  37 #define Glyph Glyph_
  38 #define Font Font_
  39
  40 #if   defined(__linux)
  41  #include <pty.h>
  42 #elif defined(__OpenBSD__) || defined(__NetBSD__) || defined(__APPLE__)
  43  #include <util.h>
  44 #elif defined(__FreeBSD__) || defined(__DragonFly__)
  45  #include <libutil.h>
  46 #endif
  47
  48
  49 /* XEMBED messages */
  50 #define XEMBED_FOCUS_IN  4
  51 #define XEMBED_FOCUS_OUT 5
  52
  53 /* Arbitrary sizes */
  54 #define UTF_INVALID   0xFFFD
  55 #define UTF_SIZ       4
  56 #define ESC_BUF_SIZ   (128*UTF_SIZ)
  57 #define ESC_ARG_SIZ   16
  58 #define STR_BUF_SIZ   ESC_BUF_SIZ
  59 #define STR_ARG_SIZ   ESC_ARG_SIZ
  60 #define DRAW_BUF_SIZ  20*1024
  61 #define XK_ANY_MOD    UINT_MAX
  62 #define XK_NO_MOD     0
  63 #define XK_SWITCH_MOD (1<<13)
  64
  65 #define REDRAW_TIMEOUT (80*1000) /* 80 ms */
  66
  67 /* macros */
  68 #define MIN(a, b)  ((a) < (b) ? (a) : (b))
  69 #define MAX(a, b)  ((a) < (b) ? (b) : (a))
  70 #define LEN(a)     (sizeof(a) / sizeof(a)[0])
  71 #define DEFAULT(a, b)     (a) = (a) ? (a) : (b)
  72 #define BETWEEN(x, a, b)  ((a) <= (x) && (x) <= (b))
  73 #define ISCONTROLC0(c) (BETWEEN(c, 0, 0x1f))
  74 #define ISCONTROLC1(c) (BETWEEN(c, 0x80, 0x9f))
  75 #define ISCONTROL(c) (ISCONTROLC0(c) || ISCONTROLC1(c))
  76 #define LIMIT(x, a, b)    (x) = (x) < (a) ? (a) : (x) > (b) ? (b) : (x)
  77 #define ATTRCMP(a, b) ((a).mode != (b).mode || (a).fg != (b).fg || (a).bg != (b).bg)
  78 #define IS_SET(flag) ((term.mode & (flag)) != 0)
  79 #define TIMEDIFF(t1, t2) ((t1.tv_sec-t2.tv_sec)*1000 + (t1.tv_usec-t2.tv_usec)/1000)
  80 #define CEIL(x) (((x) != (int) (x)) ? (x) + 1 : (x))
  81 #define MODBIT(x, set, bit) ((set) ? ((x) |= (bit)) : ((x) &= ~(bit)))
  82
  83 #define TRUECOLOR(r,g,b) (1 << 24 | (r) << 16 | (g) << 8 | (b))
  84 #define IS_TRUECOL(x)    (1 << 24 & (x))
  85 #define TRUERED(x)       (((x) & 0xff0000) >> 8)
  86 #define TRUEGREEN(x)     (((x) & 0xff00))
  87 #define TRUEBLUE(x)      (((x) & 0xff) << 8)
  88
  89
  90 #define VT102ID "\033[?6c"
  91
  92 enum glyph_attribute {
  93         ATTR_NULL      = 0,
  94         ATTR_REVERSE   = 1,
  95         ATTR_UNDERLINE = 2,
  96         ATTR_BOLD      = 4,
  97         ATTR_ITALIC    = 8,
  98         ATTR_BLINK     = 16,
  99         ATTR_WRAP      = 32,
 100         ATTR_WIDE      = 64,
 101         ATTR_WDUMMY    = 128,
 102 };
 103
 104 enum cursor_movement {
 105         CURSOR_SAVE,
 106         CURSOR_LOAD
 107 };
 108
 109 enum cursor_state {
 110         CURSOR_DEFAULT  = 0,
 111         CURSOR_WRAPNEXT = 1,
 112         CURSOR_ORIGIN   = 2
 113 };
 114
 115 enum term_mode {
 116         MODE_WRAP        = 1,
 117         MODE_INSERT      = 2,
 118         MODE_APPKEYPAD   = 4,
 119         MODE_ALTSCREEN   = 8,
 120         MODE_CRLF        = 16,
 121         MODE_MOUSEBTN    = 32,
 122         MODE_MOUSEMOTION = 64,
 123         MODE_REVERSE     = 128,
 124         MODE_KBDLOCK     = 256,
 125         MODE_HIDE        = 512,
 126         MODE_ECHO        = 1024,
 127         MODE_APPCURSOR   = 2048,
 128         MODE_MOUSESGR    = 4096,
 129         MODE_8BIT        = 8192,
 130         MODE_BLINK       = 16384,
 131         MODE_FBLINK      = 32768,
 132         MODE_FOCUS       = 65536,
 133         MODE_MOUSEX10    = 131072,
 134         MODE_MOUSEMANY   = 262144,
 135         MODE_BRCKTPASTE  = 524288,
 136         MODE_PRINT       = 1048576,
 137         MODE_MOUSE       = MODE_MOUSEBTN|MODE_MOUSEMOTION|MODE_MOUSEX10\
 138                           |MODE_MOUSEMANY,
 139 };
 140
 141 enum charset {
 142         CS_GRAPHIC0,
 143         CS_GRAPHIC1,
 144         CS_UK,
 145         CS_USA,
 146         CS_MULTI,
 147         CS_GER,
 148         CS_FIN
 149 };
 150
 151 enum escape_state {
 152         ESC_START      = 1,
 153         ESC_CSI        = 2,
 154         ESC_STR        = 4,  /* DCS, OSC, PM, APC */
 155         ESC_ALTCHARSET = 8,
 156         ESC_STR_END    = 16, /* a final string was encountered */
 157         ESC_TEST       = 32, /* Enter in test mode */
 158 };
 159
 160 enum window_state {
 161         WIN_VISIBLE = 1,
 162         WIN_REDRAW  = 2,
 163         WIN_FOCUSED = 4
 164 };
 165
 166 enum selection_type {
 167         SEL_REGULAR = 1,
 168         SEL_RECTANGULAR = 2
 169 };
 170
 171 enum selection_snap {
 172         SNAP_WORD = 1,
 173         SNAP_LINE = 2
 174 };
 175
 176 typedef unsigned char uchar;
 177 typedef unsigned int uint;
 178 typedef unsigned long ulong;
 179 typedef unsigned short ushort;
 180
 181 typedef XftDraw *Draw;
 182 typedef XftColor Color;
 183 typedef Colormap Colormap;
 184
 185 typedef struct {
 186         char c[UTF_SIZ]; /* character code */
 187         ushort mode;      /* attribute flags */
 188         uint32_t fg;      /* foreground  */
 189         uint32_t bg;      /* background  */
 190 } Glyph;
 191
 192 typedef Glyph *Line;
 193
 194 typedef struct {
 195         Glyph attr; /* current char attributes */
 196         int x;
 197         int y;
 198         char state;
 199 } TCursor;
 200
 201 /* CSI Escape sequence structs */
 202 /* ESC '[' [[ [<priv>] <arg> [;]] <mode>] */
 203 typedef struct {
 204         char buf[ESC_BUF_SIZ]; /* raw string */
 205         int len;               /* raw string length */
 206         char priv;
 207         int arg[ESC_ARG_SIZ];
 208         int narg;              /* nb of args */
 209         char mode;
 210 } CSIEscape;
 211
 212 /* STR Escape sequence structs */
 213 /* ESC type [[ [<priv>] <arg> [;]] <mode>] ESC '\' */
 214 typedef struct {
 215         char type;             /* ESC type ... */
 216         char buf[STR_BUF_SIZ]; /* raw string */
 217         int len;               /* raw string length */
 218         char *args[STR_ARG_SIZ];
 219         int narg;              /* nb of args */
 220 } STREscape;
 221
 222 /* Internal representation of the screen */
 223 typedef struct {
 224         int row;      /* nb row */
 225         int col;      /* nb col */
 226         Line *line;   /* screen */
 227         Line *alt;    /* alternate screen */
 228         bool *dirty;  /* dirtyness of lines */
 229         TCursor c;    /* cursor */
 230         int top;      /* top    scroll limit */
 231         int bot;      /* bottom scroll limit */
 232         int mode;     /* terminal mode flags */
 233         int esc;      /* escape state flags */
 234         char trantbl[4]; /* charset table translation */
 235         int charset;  /* current charset */
 236         int icharset; /* selected charset for sequence */
 237         bool numlock; /* lock numbers in keyboard */
 238         bool *tabs;
 239 } Term;
 240
 241 /* Purely graphic info */
 242 typedef struct {
 243         Display *dpy;
 244         Colormap cmap;
 245         Window win;
 246         Drawable buf;
 247         Atom xembed, wmdeletewin, netwmname, netwmpid;
 248         XIM xim;
 249         XIC xic;
 250         Draw draw;
 251         Visual *vis;
 252         XSetWindowAttributes attrs;
 253         int scr;
 254         bool isfixed; /* is fixed geometry? */
 255         int l, t; /* left and top offset */
 256         int gm; /* geometry mask */
 257         int tw, th; /* tty width and height */
 258         int w, h; /* window width and height */
 259         int ch; /* char height */
 260         int cw; /* char width  */
 261         char state; /* focus, redraw, visible */
 262 } XWindow;
 263
 264 typedef struct {
 265         uint b;
 266         uint mask;
 267         char *s;
 268 } Mousekey;
 269
 270 typedef struct {
 271         KeySym k;
 272         uint mask;
 273         char *s;
 274         /* three valued logic variables: 0 indifferent, 1 on, -1 off */
 275         signed char appkey;    /* application keypad */
 276         signed char appcursor; /* application cursor */
 277         signed char crlf;      /* crlf mode          */
 278 } Key;
 279
 280 typedef struct {
 281         int mode;
 282         int type;
 283         int snap;
 284         /*
 285          * Selection variables:
 286          * nb – normalized coordinates of the beginning of the selection
 287          * ne – normalized coordinates of the end of the selection
 288          * ob – original coordinates of the beginning of the selection
 289          * oe – original coordinates of the end of the selection
 290          */
 291         struct {
 292                 int x, y;
 293         } nb, ne, ob, oe;
 294
 295         char *clip;
 296         Atom xtarget;
 297         bool alt;
 298         struct timeval tclick1;
 299         struct timeval tclick2;
 300 } Selection;
 301
 302 typedef union {
 303         int i;
 304         uint ui;
 305         float f;
 306         const void *v;
 307 } Arg;
 308
 309 typedef struct {
 310         uint mod;
 311         KeySym keysym;
 312         void (*func)(const Arg *);
 313         const Arg arg;
 314 } Shortcut;
 315
 316 /* function definitions used in config.h */
 317 static void clippaste(const Arg *);
 318 static void numlock(const Arg *);
 319 static void selpaste(const Arg *);
 320 static void xzoom(const Arg *);
 321 static void printsel(const Arg *);
 322 static void printscreen(const Arg *) ;
 323 static void toggleprinter(const Arg *);
 324
 325 /* Config.h for applying patches and the configuration. */
 326 #include "config.h"
 327
 328 /* Font structure */
 329 typedef struct {
 330         int height;
 331         int width;
 332         int ascent;
 333         int descent;
 334         short lbearing;
 335         short rbearing;
 336         XftFont *match;
 337         FcFontSet *set;
 338         FcPattern *pattern;
 339 } Font;
 340
 341 /* Drawing Context */
 342 typedef struct {
 343         Color col[MAX(LEN(colorname), 256)];
 344         Font font, bfont, ifont, ibfont;
 345         GC gc;
 346 } DC;
 347
 348 static void die(const char *, ...);
 349 static void draw(void);
 350 static void redraw(int);
 351 static void drawregion(int, int, int, int);
 352 static void execsh(void);
 353 static void sigchld(int);
 354 static void run(void);
 355
 356 static void csidump(void);
 357 static void csihandle(void);
 358 static void csiparse(void);
 359 static void csireset(void);
 360 static void strdump(void);
 361 static void strhandle(void);
 362 static void strparse(void);
 363 static void strreset(void);
 364
 365 static int tattrset(int);
 366 static void tprinter(char *, size_t);
 367 static void tdumpsel(void);
 368 static void tdumpline(int);
 369 static void tdump(void);
 370 static void tclearregion(int, int, int, int);
 371 static void tcursor(int);
 372 static void tdeletechar(int);
 373 static void tdeleteline(int);
 374 static void tinsertblank(int);
 375 static void tinsertblankline(int);
 376 static void tmoveto(int, int);
 377 static void tmoveato(int, int);
 378 static void tnew(int, int);
 379 static void tnewline(int);
 380 static void tputtab(int);
 381 static void tputc(char *, int);
 382 static void treset(void);
 383 static int tresize(int, int);
 384 static void tscrollup(int, int);
 385 static void tscrolldown(int, int);
 386 static void tsetattr(int *, int);
 387 static void tsetchar(char *, Glyph *, int, int);
 388 static void tsetscroll(int, int);
 389 static void tswapscreen(void);
 390 static void tsetdirt(int, int);
 391 static void tsetdirtattr(int);
 392 static void tsetmode(bool, bool, int *, int);
 393 static void tfulldirt(void);
 394 static void techo(char *, int);
 395 static void tcontrolcode(uchar );
 396 static void tdectest(char );
 397 static int32_t tdefcolor(int *, int *, int);
 398 static void tdeftran(char);
 399 static inline bool match(uint, uint);
 400 static void ttynew(void);
 401 static void ttyread(void);
 402 static void ttyresize(void);
 403 static void ttysend(char *, size_t);
 404 static void ttywrite(const char *, size_t);
 405
 406 static void xdraws(char *, Glyph, int, int, int, int);
 407 static void xhints(void);
 408 static void xclear(int, int, int, int);
 409 static void xdrawcursor(void);
 410 static void xinit(void);
 411 static void xloadcols(void);
 412 static int xsetcolorname(int, const char *);
 413 static int xgeommasktogravity(int);
 414 static int xloadfont(Font *, FcPattern *);
 415 static void xloadfonts(char *, double);
 416 static int xloadfontset(Font *);
 417 static void xsettitle(char *);
 418 static void xresettitle(void);
 419 static void xsetpointermotion(int);
 420 static void xseturgency(int);
 421 static void xsetsel(char *);
 422 static void xtermclear(int, int, int, int);
 423 static void xunloadfont(Font *);
 424 static void xunloadfonts(void);
 425 static void xresize(int, int);
 426
 427 static void expose(XEvent *);
 428 static void visibility(XEvent *);
 429 static void unmap(XEvent *);
 430 static char *kmap(KeySym, uint);
 431 static void kpress(XEvent *);
 432 static void cmessage(XEvent *);
 433 static void cresize(int, int);
 434 static void resize(XEvent *);
 435 static void focus(XEvent *);
 436 static void brelease(XEvent *);
 437 static void bpress(XEvent *);
 438 static void bmotion(XEvent *);
 439 static void selnotify(XEvent *);
 440 static void selclear(XEvent *);
 441 static void selrequest(XEvent *);
 442
 443 static void selinit(void);
 444 static void selnormalize(void);
 445 static inline bool selected(int, int);
 446 static char *getsel(void);
 447 static void selcopy(void);
 448 static void selscroll(int, int);
 449 static void selsnap(int, int *, int *, int);
 450 static void getbuttoninfo(XEvent *);
 451 static void mousereport(XEvent *);
 452
 453 static size_t utf8decode(char *, long *, size_t);
 454 static long utf8decodebyte(char, size_t *);
 455 static size_t utf8encode(long, char *, size_t);
 456 static char utf8encodebyte(long, size_t);
 457 static size_t utf8len(char *);
 458 static size_t utf8validate(long *, size_t);
 459
 460 static ssize_t xwrite(int, const char *, size_t);
 461 static void *xmalloc(size_t);
 462 static void *xrealloc(void *, size_t);
 463 static char *xstrdup(char *);
 464
 465 static void usage(void);
 466
 467 static void (*handler[LASTEvent])(XEvent *) = {
 468         [KeyPress] = kpress,
 469         [ClientMessage] = cmessage,
 470         [ConfigureNotify] = resize,
 471         [VisibilityNotify] = visibility,
 472         [UnmapNotify] = unmap,
 473         [Expose] = expose,
 474         [FocusIn] = focus,
 475         [FocusOut] = focus,
 476         [MotionNotify] = bmotion,
 477         [ButtonPress] = bpress,
 478         [ButtonRelease] = brelease,
 479         [SelectionClear] = selclear,
 480         [SelectionNotify] = selnotify,
 481         [SelectionRequest] = selrequest,
 482 };
 483
 484 /* Globals */
 485 static DC dc;
 486 static XWindow xw;
 487 static Term term;
 488 static CSIEscape csiescseq;
 489 static STREscape strescseq;
 490 static int cmdfd;
 491 static pid_t pid;
 492 static Selection sel;
 493 static int iofd = STDOUT_FILENO;
 494 static char **opt_cmd = NULL;
 495 static char *opt_io = NULL;
 496 static char *opt_title = NULL;
 497 static char *opt_embed = NULL;
 498 static char *opt_class = NULL;
 499 static char *opt_font = NULL;
 500 static int oldbutton = 3; /* button event on startup: 3 = release */
 501
 502 static char *usedfont = NULL;
 503 static double usedfontsize = 0;
 504
 505 static uchar utfbyte[UTF_SIZ + 1] = {0x80,    0, 0xC0, 0xE0, 0xF0};
 506 static uchar utfmask[UTF_SIZ + 1] = {0xC0, 0x80, 0xE0, 0xF0, 0xF8};
 507 static long utfmin[UTF_SIZ + 1] = {       0,    0,  0x80,  0x800,  0x10000};
 508 static long utfmax[UTF_SIZ + 1] = {0x10FFFF, 0x7F, 0x7FF, 0xFFFF, 0x10FFFF};
 509
 510 /* Font Ring Cache */
 511 enum {
 512         FRC_NORMAL,
 513         FRC_ITALIC,
 514         FRC_BOLD,
 515         FRC_ITALICBOLD
 516 };
 517
 518 typedef struct {
 519         XftFont *font;
 520         int flags;
 521 } Fontcache;
 522
 523 /* Fontcache is an array now. A new font will be appended to the array. */
 524 static Fontcache frc[16];
 525 static int frclen = 0;
 526
 527 ssize_t
 528 xwrite(int fd, const char *s, size_t len) {
 529         size_t aux = len;
 530
 531         while(len > 0) {
 532                 ssize_t r = write(fd, s, len);
 533                 if(r < 0)
 534                         return r;
 535                 len -= r;
 536                 s += r;
 537         }
 538         return aux;
 539 }
 540
 541 void *
 542 xmalloc(size_t len) {
 543         void *p = malloc(len);
 544
 545         if(!p)
 546                 die("Out of memory\n");
 547
 548         return p;
 549 }
 550
 551 void *
 552 xrealloc(void *p, size_t len) {
 553         if((p = realloc(p, len)) == NULL)
 554                 die("Out of memory\n");
 555
 556         return p;
 557 }
 558
 559 char *
 560 xstrdup(char *s) {
 561         if((s = strdup(s)) == NULL)
 562                 die("Out of memory\n");
 563
 564         return s;
 565 }
 566
 567 size_t
 568 utf8decode(char *c, long *u, size_t clen) {
 569         size_t i, j, len, type;
 570         long udecoded;
 571
 572         *u = UTF_INVALID;
 573         if(!clen)
 574                 return 0;
 575         udecoded = utf8decodebyte(c[0], &len);
 576         if(!BETWEEN(len, 1, UTF_SIZ))
 577                 return 1;
 578         for(i = 1, j = 1; i < clen && j < len; ++i, ++j) {
 579                 udecoded = (udecoded << 6) | utf8decodebyte(c[i], &type);
 580                 if(type != 0)
 581                         return j;
 582         }
 583         if(j < len)
 584                 return 0;
 585         *u = udecoded;
 586         utf8validate(u, len);
 587         return len;
 588 }
 589
 590 long
 591 utf8decodebyte(char c, size_t *i) {
 592         for(*i = 0; *i < LEN(utfmask); ++(*i))
 593                 if(((uchar)c & utfmask[*i]) == utfbyte[*i])
 594                         return (uchar)c & ~utfmask[*i];
 595         return 0;
 596 }
 597
 598 size_t
 599 utf8encode(long u, char *c, size_t clen) {
 600         size_t len, i;
 601
 602         len = utf8validate(&u, 0);
 603         if(clen < len)
 604                 return 0;
 605         for(i = len - 1; i != 0; --i) {
 606                 c[i] = utf8encodebyte(u, 0);
 607                 u >>= 6;
 608         }
 609         c[0] = utf8encodebyte(u, len);
 610         return len;
 611 }
 612
 613 char
 614 utf8encodebyte(long u, size_t i) {
 615         return utfbyte[i] | (u & ~utfmask[i]);
 616 }
 617
 618 size_t
 619 utf8len(char *c) {
 620         return utf8decode(c, &(long){0}, UTF_SIZ);
 621 }
 622
 623 size_t
 624 utf8validate(long *u, size_t i) {
 625         if(!BETWEEN(*u, utfmin[i], utfmax[i]) || BETWEEN(*u, 0xD800, 0xDFFF))
 626                 *u = UTF_INVALID;
 627         for(i = 1; *u > utfmax[i]; ++i)
 628                 ;
 629         return i;
 630 }
 631
 632 static void
 633 selinit(void) {
 634         memset(&sel.tclick1, 0, sizeof(sel.tclick1));
 635         memset(&sel.tclick2, 0, sizeof(sel.tclick2));
 636         sel.mode = 0;
 637         sel.ob.x = -1;
 638         sel.clip = NULL;
 639         sel.xtarget = XInternAtom(xw.dpy, "UTF8_STRING", 0);
 640         if(sel.xtarget == None)
 641                 sel.xtarget = XA_STRING;
 642 }
 643
 644 static int
 645 x2col(int x) {
 646         x -= borderpx;
 647         x /= xw.cw;
 648
 649         return LIMIT(x, 0, term.col-1);
 650 }
 651
 652 static int
 653 y2row(int y) {
 654         y -= borderpx;
 655         y /= xw.ch;
 656
 657         return LIMIT(y, 0, term.row-1);
 658 }
 659
 660 static int tlinelen(int y) {
 661         int i = term.col;
 662
 663         while (i > 0 && term.line[y][i - 1].c[0] == ' ')
 664                 --i;
 665
 666         return i;
 667 }
 668
 669 static void
 670 selnormalize(void) {
 671         int i;
 672
 673         if(sel.ob.y == sel.oe.y) {
 674                 sel.nb.x = MIN(sel.ob.x, sel.oe.x);
 675                 sel.ne.x = MAX(sel.ob.x, sel.oe.x);
 676         } else {
 677                 sel.nb.x = sel.ob.y < sel.oe.y ? sel.ob.x : sel.oe.x;
 678                 sel.ne.x = sel.ob.y < sel.oe.y ? sel.oe.x : sel.ob.x;
 679         }
 680         sel.nb.y = MIN(sel.ob.y, sel.oe.y);
 681         sel.ne.y = MAX(sel.ob.y, sel.oe.y);
 682
 683         /* expand selection over line breaks */
 684         if (sel.type == SEL_RECTANGULAR)
 685                 return;
 686         i = tlinelen(sel.nb.y);
 687         if (i < sel.nb.x)
 688                 sel.nb.x = i;
 689         if (tlinelen(sel.ne.y) <= sel.ne.x)
 690                 sel.ne.x = term.col - 1;
 691 }
 692
 693 static inline bool
 694 selected(int x, int y) {
 695         if(sel.type == SEL_RECTANGULAR)
 696                 return BETWEEN(y, sel.nb.y, sel.ne.y)
 697                     && BETWEEN(x, sel.nb.x, sel.ne.x);
 698
 699         return BETWEEN(y, sel.nb.y, sel.ne.y)
 700             && (y != sel.nb.y || x >= sel.nb.x)
 701             && (y != sel.ne.y || x <= sel.ne.x);
 702 }
 703
 704 void
 705 selsnap(int mode, int *x, int *y, int direction) {
 706         switch(mode) {
 707         case SNAP_WORD:
 708                 /*
 709                  * Snap around if the word wraps around at the end or
 710                  * beginning of a line.
 711                  */
 712                 for(;;) {
 713                         if(direction < 0 && *x <= 0) {
 714                                 if(*y > 0 && term.line[*y - 1][term.col-1].mode
 715                                                 & ATTR_WRAP) {
 716                                         *y -= 1;
 717                                         *x = term.col-1;
 718                                 } else {
 719                                         break;
 720                                 }
 721                         }
 722                         if(direction > 0 && *x >= term.col-1) {
 723                                 if(*y < term.row-1 && term.line[*y][*x].mode
 724                                                 & ATTR_WRAP) {
 725                                         *y += 1;
 726                                         *x = 0;
 727                                 } else {
 728                                         break;
 729                                 }
 730                         }
 731
 732                         if(term.line[*y][*x+direction].mode & ATTR_WDUMMY) {
 733                                 *x += direction;
 734                                 continue;
 735                         }
 736
 737                         if(*x >= tlinelen(*y) || strchr(worddelimiters,
 738                                         term.line[*y][*x+direction].c[0])) {
 739                                 break;
 740                         }
 741
 742                         *x += direction;
 743                 }
 744                 break;
 745         case SNAP_LINE:
 746                 /*
 747                  * Snap around if the the previous line or the current one
 748                  * has set ATTR_WRAP at its end. Then the whole next or
 749                  * previous line will be selected.
 750                  */
 751                 *x = (direction < 0) ? 0 : term.col - 1;
 752                 if(direction < 0 && *y > 0) {
 753                         for(; *y > 0; *y += direction) {
 754                                 if(!(term.line[*y-1][term.col-1].mode
 755                                                 & ATTR_WRAP)) {
 756                                         break;
 757                                 }
 758                         }
 759                 } else if(direction > 0 && *y < term.row-1) {
 760                         for(; *y < term.row; *y += direction) {
 761                                 if(!(term.line[*y][term.col-1].mode
 762                                                 & ATTR_WRAP)) {
 763                                         break;
 764                                 }
 765                         }
 766                 }
 767                 break;
 768         }
 769 }
 770
 771 void
 772 getbuttoninfo(XEvent *e) {
 773         int type;
 774         uint state = e->xbutton.state & ~(Button1Mask | forceselmod);
 775
 776         sel.alt = IS_SET(MODE_ALTSCREEN);
 777
 778         sel.oe.x = x2col(e->xbutton.x);
 779         sel.oe.y = y2row(e->xbutton.y);
 780
 781         if(sel.ob.y < sel.oe.y
 782                         || (sel.ob.y == sel.oe.y && sel.ob.x < sel.oe.x)) {
 783                 selsnap(sel.snap, &sel.ob.x, &sel.ob.y, -1);
 784                 selsnap(sel.snap, &sel.oe.x, &sel.oe.y, +1);
 785         } else {
 786                 selsnap(sel.snap, &sel.oe.x, &sel.oe.y, -1);
 787                 selsnap(sel.snap, &sel.ob.x, &sel.ob.y, +1);
 788         }
 789         selnormalize();
 790
 791         sel.type = SEL_REGULAR;
 792         for(type = 1; type < LEN(selmasks); ++type) {
 793                 if(match(selmasks[type], state)) {
 794                         sel.type = type;
 795                         break;
 796                 }
 797         }
 798 }
 799
 800 void
 801 mousereport(XEvent *e) {
 802         int x = x2col(e->xbutton.x), y = y2row(e->xbutton.y),
 803             button = e->xbutton.button, state = e->xbutton.state,
 804             len;
 805         char buf[40];
 806         static int ox, oy;
 807
 808         /* from urxvt */
 809         if(e->xbutton.type == MotionNotify) {
 810                 if(x == ox && y == oy)
 811                         return;
 812                 if(!IS_SET(MODE_MOUSEMOTION) && !IS_SET(MODE_MOUSEMANY))
 813                         return;
 814                 /* MOUSE_MOTION: no reporting if no button is pressed */
 815                 if(IS_SET(MODE_MOUSEMOTION) && oldbutton == 3)
 816                         return;
 817
 818                 button = oldbutton + 32;
 819                 ox = x;
 820                 oy = y;
 821         } else {
 822                 if(!IS_SET(MODE_MOUSESGR) && e->xbutton.type == ButtonRelease) {
 823                         button = 3;
 824                 } else {
 825                         button -= Button1;
 826                         if(button >= 3)
 827                                 button += 64 - 3;
 828                 }
 829                 if(e->xbutton.type == ButtonPress) {
 830                         oldbutton = button;
 831                         ox = x;
 832                         oy = y;
 833                 } else if(e->xbutton.type == ButtonRelease) {
 834                         oldbutton = 3;
 835                         /* MODE_MOUSEX10: no button release reporting */
 836                         if(IS_SET(MODE_MOUSEX10))
 837                                 return;
 838                         if (button == 64 || button == 65)
 839                                 return;
 840                 }
 841         }
 842
 843         if(!IS_SET(MODE_MOUSEX10)) {
 844                 button += (state & ShiftMask   ? 4  : 0)
 845                         + (state & Mod4Mask    ? 8  : 0)
 846                         + (state & ControlMask ? 16 : 0);
 847         }
 848
 849         len = 0;
 850         if(IS_SET(MODE_MOUSESGR)) {
 851                 len = snprintf(buf, sizeof(buf), "\033[<%d;%d;%d%c",
 852                                 button, x+1, y+1,
 853                                 e->xbutton.type == ButtonRelease ? 'm' : 'M');
 854         } else if(x < 223 && y < 223) {
 855                 len = snprintf(buf, sizeof(buf), "\033[M%c%c%c",
 856                                 32+button, 32+x+1, 32+y+1);
 857         } else {
 858                 return;
 859         }
 860
 861         ttywrite(buf, len);
 862 }
 863
 864 void
 865 bpress(XEvent *e) {
 866         struct timeval now;
 867         Mousekey *mk;
 868
 869         if(IS_SET(MODE_MOUSE) && !(e->xbutton.state & forceselmod)) {
 870                 mousereport(e);
 871                 return;
 872         }
 873
 874         for(mk = mshortcuts; mk < mshortcuts + LEN(mshortcuts); mk++) {
 875                 if(e->xbutton.button == mk->b
 876                                 && match(mk->mask, e->xbutton.state)) {
 877                         ttysend(mk->s, strlen(mk->s));
 878                         return;
 879                 }
 880         }
 881
 882         if(e->xbutton.button == Button1) {
 883                 gettimeofday(&now, NULL);
 884
 885                 /* Clear previous selection, logically and visually. */
 886                 selclear(NULL);
 887                 sel.mode = 1;
 888                 sel.type = SEL_REGULAR;
 889                 sel.oe.x = sel.ob.x = x2col(e->xbutton.x);
 890                 sel.oe.y = sel.ob.y = y2row(e->xbutton.y);
 891
 892                 /*
 893                  * If the user clicks below predefined timeouts specific
 894                  * snapping behaviour is exposed.
 895                  */
 896                 if(TIMEDIFF(now, sel.tclick2) <= tripleclicktimeout) {
 897                         sel.snap = SNAP_LINE;
 898                 } else if(TIMEDIFF(now, sel.tclick1) <= doubleclicktimeout) {
 899                         sel.snap = SNAP_WORD;
 900                 } else {
 901                         sel.snap = 0;
 902                 }
 903                 selsnap(sel.snap, &sel.ob.x, &sel.ob.y, -1);
 904                 selsnap(sel.snap, &sel.oe.x, &sel.oe.y, +1);
 905                 selnormalize();
 906
 907                 /*
 908                  * Draw selection, unless it's regular and we don't want to
 909                  * make clicks visible
 910                  */
 911                 if(sel.snap != 0) {
 912                         sel.mode++;
 913                         tsetdirt(sel.nb.y, sel.ne.y);
 914                 }
 915                 sel.tclick2 = sel.tclick1;
 916                 sel.tclick1 = now;
 917         }
 918 }
 919
 920 char *
 921 getsel(void) {
 922         char *str, *ptr;
 923         int x, y, bufsize, size, i, ex;
 924         Glyph *gp, *last;
 925
 926         if(sel.ob.x == -1)
 927                 return NULL;
 928
 929         bufsize = (term.col+1) * (sel.ne.y-sel.nb.y+1) * UTF_SIZ;
 930         ptr = str = xmalloc(bufsize);
 931
 932         /* append every set & selected glyph to the selection */
 933         for(y = sel.nb.y; y < sel.ne.y + 1; y++) {
 934                 gp = &term.line[y][0];
 935                 last = &gp[term.col-1];
 936
 937                 while(last >= gp && !(selected(last - gp, y) &&
 938                                       strcmp(last->c, " ") != 0)) {
 939                         --last;
 940                 }
 941
 942                 for(x = 0; gp <= last; x++, ++gp) {
 943                         if(!selected(x, y) || (gp->mode & ATTR_WDUMMY))
 944                                 continue;
 945
 946                         size = utf8len(gp->c);
 947                         memcpy(ptr, gp->c, size);
 948                         ptr += size;
 949                 }
 950
 951                 /*
 952                  * Copy and pasting of line endings is inconsistent
 953                  * in the inconsistent terminal and GUI world.
 954                  * The best solution seems like to produce '\n' when
 955                  * something is copied from st and convert '\n' to
 956                  * '\r', when something to be pasted is received by
 957                  * st.
 958                  * FIXME: Fix the computer world.
 959                  */
 960                 if(y < sel.ne.y && !(x > 0 && (gp-1)->mode & ATTR_WRAP))
 961                         *ptr++ = '\n';
 962
 963                 /*
 964                  * If the last selected line expands in the selection
 965                  * after the visible text '\n' is appended.
 966                  */
 967                 if(y == sel.ne.y) {
 968                         i = term.col;
 969                         while(--i > 0 && term.line[y][i].c[0] == ' ')
 970                                 /* nothing */;
 971                         ex = sel.ne.x;
 972                         if(sel.nb.y == sel.ne.y && sel.ne.x < sel.nb.x)
 973                                 ex = sel.nb.x;
 974                         if(i < ex)
 975                                 *ptr++ = '\n';
 976                 }
 977         }
 978         *ptr = 0;
 979         return str;
 980 }
 981
 982 void
 983 selcopy(void) {
 984         xsetsel(getsel());
 985 }
 986
 987 void
 988 selnotify(XEvent *e) {
 989         ulong nitems, ofs, rem;
 990         int format;
 991         uchar *data, *last, *repl;
 992         Atom type;
 993
 994         ofs = 0;
 995         do {
 996                 if(XGetWindowProperty(xw.dpy, xw.win, XA_PRIMARY, ofs, BUFSIZ/4,
 997                                         False, AnyPropertyType, &type, &format,
 998                                         &nitems, &rem, &data)) {
 999                         fprintf(stderr, "Clipboard allocation failed\n");
1000                         return;
1001                 }
1002
1003                 /*
1004                  * As seen in getsel:
1005                  * Line endings are inconsistent in the terminal and GUI world
1006                  * copy and pasting. When receiving some selection data,
1007                  * replace all '\n' with '\r'.
1008                  * FIXME: Fix the computer world.
1009                  */
1010                 repl = data;
1011                 last = data + nitems * format / 8;
1012                 while((repl = memchr(repl, '\n', last - repl))) {
1013                         *repl++ = '\r';
1014                 }
1015
1016                 if(IS_SET(MODE_BRCKTPASTE))
1017                         ttywrite("\033[200~", 6);
1018                 ttysend((char *)data, nitems * format / 8);
1019                 if(IS_SET(MODE_BRCKTPASTE))
1020                         ttywrite("\033[201~", 6);
1021                 XFree(data);
1022                 /* number of 32-bit chunks returned */
1023                 ofs += nitems * format / 32;
1024         } while(rem > 0);
1025 }
1026
1027 void
1028 selpaste(const Arg *dummy) {
1029         XConvertSelection(xw.dpy, XA_PRIMARY, sel.xtarget, XA_PRIMARY,
1030                         xw.win, CurrentTime);
1031 }
1032
1033 void
1034 clippaste(const Arg *dummy) {
1035         Atom clipboard;
1036
1037         clipboard = XInternAtom(xw.dpy, "CLIPBOARD", 0);
1038         XConvertSelection(xw.dpy, clipboard, sel.xtarget, XA_PRIMARY,
1039                         xw.win, CurrentTime);
1040 }
1041
1042 void
1043 selclear(XEvent *e) {
1044         if(sel.ob.x == -1)
1045                 return;
1046         sel.ob.x = -1;
1047         tsetdirt(sel.nb.y, sel.ne.y);
1048 }
1049
1050 void
1051 selrequest(XEvent *e) {
1052         XSelectionRequestEvent *xsre;
1053         XSelectionEvent xev;
1054         Atom xa_targets, string;
1055
1056         xsre = (XSelectionRequestEvent *) e;
1057         xev.type = SelectionNotify;
1058         xev.requestor = xsre->requestor;
1059         xev.selection = xsre->selection;
1060         xev.target = xsre->target;
1061         xev.time = xsre->time;
1062         /* reject */
1063         xev.property = None;
1064
1065         xa_targets = XInternAtom(xw.dpy, "TARGETS", 0);
1066         if(xsre->target == xa_targets) {
1067                 /* respond with the supported type */
1068                 string = sel.xtarget;
1069                 XChangeProperty(xsre->display, xsre->requestor, xsre->property,
1070                                 XA_ATOM, 32, PropModeReplace,
1071                                 (uchar *) &string, 1);
1072                 xev.property = xsre->property;
1073         } else if(xsre->target == sel.xtarget && sel.clip != NULL) {
1074                 XChangeProperty(xsre->display, xsre->requestor, xsre->property,
1075                                 xsre->target, 8, PropModeReplace,
1076                                 (uchar *) sel.clip, strlen(sel.clip));
1077                 xev.property = xsre->property;
1078         }
1079
1080         /* all done, send a notification to the listener */
1081         if(!XSendEvent(xsre->display, xsre->requestor, True, 0, (XEvent *) &xev))
1082                 fprintf(stderr, "Error sending SelectionNotify event\n");
1083 }
1084
1085 void
1086 xsetsel(char *str) {
1087         /* register the selection for both the clipboard and the primary */
1088         Atom clipboard;
1089
1090         free(sel.clip);
1091         sel.clip = str;
1092
1093         XSetSelectionOwner(xw.dpy, XA_PRIMARY, xw.win, CurrentTime);
1094
1095         clipboard = XInternAtom(xw.dpy, "CLIPBOARD", 0);
1096         XSetSelectionOwner(xw.dpy, clipboard, xw.win, CurrentTime);
1097 }
1098
1099 void
1100 brelease(XEvent *e) {
1101         if(IS_SET(MODE_MOUSE) && !(e->xbutton.state & forceselmod)) {
1102                 mousereport(e);
1103                 return;
1104         }
1105
1106         if(e->xbutton.button == Button2) {
1107                 selpaste(NULL);
1108         } else if(e->xbutton.button == Button1) {
1109                 if(sel.mode < 2) {
1110                         selclear(NULL);
1111                 } else {
1112                         getbuttoninfo(e);
1113                         selcopy();
1114                 }
1115                 sel.mode = 0;
1116                 tsetdirt(sel.nb.y, sel.ne.y);
1117         }
1118 }
1119
1120 void
1121 bmotion(XEvent *e) {
1122         int oldey, oldex, oldsby, oldsey;
1123
1124         if(IS_SET(MODE_MOUSE) && !(e->xbutton.state & forceselmod)) {
1125                 mousereport(e);
1126                 return;
1127         }
1128
1129         if(!sel.mode)
1130                 return;
1131
1132         sel.mode++;
1133         oldey = sel.oe.y;
1134         oldex = sel.oe.x;
1135         oldsby = sel.nb.y;
1136         oldsey = sel.ne.y;
1137         getbuttoninfo(e);
1138
1139         if(oldey != sel.oe.y || oldex != sel.oe.x)
1140                 tsetdirt(MIN(sel.nb.y, oldsby), MAX(sel.ne.y, oldsey));
1141 }
1142
1143 void
1144 die(const char *errstr, ...) {
1145         va_list ap;
1146
1147         va_start(ap, errstr);
1148         vfprintf(stderr, errstr, ap);
1149         va_end(ap);
1150         exit(EXIT_FAILURE);
1151 }
1152
1153 void
1154 execsh(void) {
1155         char **args;
1156         char *envshell = getenv("SHELL");
1157         const struct passwd *pass = getpwuid(getuid());
1158         char buf[sizeof(long) * 8 + 1];
1159
1160         unsetenv("COLUMNS");
1161         unsetenv("LINES");
1162         unsetenv("TERMCAP");
1163
1164         if(pass) {
1165                 setenv("LOGNAME", pass->pw_name, 1);
1166                 setenv("USER", pass->pw_name, 1);
1167                 setenv("SHELL", pass->pw_shell, 0);
1168                 setenv("HOME", pass->pw_dir, 0);
1169         }
1170
1171         snprintf(buf, sizeof(buf), "%lu", xw.win);
1172         setenv("WINDOWID", buf, 1);
1173
1174         signal(SIGCHLD, SIG_DFL);
1175         signal(SIGHUP, SIG_DFL);
1176         signal(SIGINT, SIG_DFL);
1177         signal(SIGQUIT, SIG_DFL);
1178         signal(SIGTERM, SIG_DFL);
1179         signal(SIGALRM, SIG_DFL);
1180
1181         DEFAULT(envshell, shell);
1182         setenv("TERM", termname, 1);
1183         args = opt_cmd ? opt_cmd : (char *[]){envshell, "-i", NULL};
1184         execvp(args[0], args);
1185         exit(EXIT_FAILURE);
1186 }
1187
1188 void
1189 sigchld(int a) {
1190         int stat = 0;
1191
1192         if(waitpid(pid, &stat, 0) < 0)
1193                 die("Waiting for pid %hd failed: %s\n", pid, strerror(errno));
1194
1195         if(WIFEXITED(stat)) {
1196                 exit(WEXITSTATUS(stat));
1197         } else {
1198                 exit(EXIT_FAILURE);
1199         }
1200 }
1201
1202 void
1203 ttynew(void) {
1204         int m, s;
1205         struct winsize w = {term.row, term.col, 0, 0};
1206
1207         /* seems to work fine on linux, openbsd and freebsd */
1208         if(openpty(&m, &s, NULL, NULL, &w) < 0)
1209                 die("openpty failed: %s\n", strerror(errno));
1210
1211         switch(pid = fork()) {
1212         case -1:
1213                 die("fork failed\n");
1214                 break;
1215         case 0:
1216                 setsid(); /* create a new process group */
1217                 dup2(s, STDIN_FILENO);
1218                 dup2(s, STDOUT_FILENO);
1219                 dup2(s, STDERR_FILENO);
1220                 if(ioctl(s, TIOCSCTTY, NULL) < 0)
1221                         die("ioctl TIOCSCTTY failed: %s\n", strerror(errno));
1222                 close(s);
1223                 close(m);
1224                 execsh();
1225                 break;
1226         default:
1227                 close(s);
1228                 cmdfd = m;
1229                 signal(SIGCHLD, sigchld);
1230                 if(opt_io) {
1231                         term.mode |= MODE_PRINT;
1232                         iofd = (!strcmp(opt_io, "-")) ?
1233                                   STDOUT_FILENO :
1234                                   open(opt_io, O_WRONLY | O_CREAT, 0666);
1235                         if(iofd < 0) {
1236                                 fprintf(stderr, "Error opening %s:%s\n",
1237                                         opt_io, strerror(errno));
1238                         }
1239                 }
1240                 break;
1241         }
1242 }
1243
1244 void
1245 ttyread(void) {
1246         static char buf[BUFSIZ];
1247         static int buflen = 0;
1248         char *ptr;
1249         char s[UTF_SIZ];
1250         int charsize; /* size of utf8 char in bytes */
1251         long unicodep;
1252         int ret;
1253
1254         /* append read bytes to unprocessed bytes */
1255         if((ret = read(cmdfd, buf+buflen, LEN(buf)-buflen)) < 0)
1256                 die("Couldn't read from shell: %s\n", strerror(errno));
1257
1258         /* process every complete utf8 char */
1259         buflen += ret;
1260         ptr = buf;
1261         while((charsize = utf8decode(ptr, &unicodep, buflen))) {
1262                 utf8encode(unicodep, s, UTF_SIZ);
1263                 tputc(s, charsize);
1264                 ptr += charsize;
1265                 buflen -= charsize;
1266         }
1267
1268         /* keep any uncomplete utf8 char for the next call */
1269         memmove(buf, ptr, buflen);
1270 }
1271
1272 void
1273 ttywrite(const char *s, size_t n) {
1274         if(xwrite(cmdfd, s, n) == -1)
1275                 die("write error on tty: %s\n", strerror(errno));
1276 }
1277
1278 void
1279 ttysend(char *s, size_t n) {
1280         ttywrite(s, n);
1281         if(IS_SET(MODE_ECHO))
1282                 techo(s, n);
1283 }
1284
1285 void
1286 ttyresize(void) {
1287         struct winsize w;
1288
1289         w.ws_row = term.row;
1290         w.ws_col = term.col;
1291         w.ws_xpixel = xw.tw;
1292         w.ws_ypixel = xw.th;
1293         if(ioctl(cmdfd, TIOCSWINSZ, &w) < 0)
1294                 fprintf(stderr, "Couldn't set window size: %s\n", strerror(errno));
1295 }
1296
1297 int
1298 tattrset(int attr) {
1299         int i, j;
1300
1301         for(i = 0; i < term.row-1; i++) {
1302                 for(j = 0; j < term.col-1; j++) {
1303                         if(term.line[i][j].mode & attr)
1304                                 return 1;
1305                 }
1306         }
1307
1308         return 0;
1309 }
1310
1311 void
1312 tsetdirt(int top, int bot) {
1313         int i;
1314
1315         LIMIT(top, 0, term.row-1);
1316         LIMIT(bot, 0, term.row-1);
1317
1318         for(i = top; i <= bot; i++)
1319                 term.dirty[i] = 1;
1320 }
1321
1322 void
1323 tsetdirtattr(int attr) {
1324         int i, j;
1325
1326         for(i = 0; i < term.row-1; i++) {
1327                 for(j = 0; j < term.col-1; j++) {
1328                         if(term.line[i][j].mode & attr) {
1329                                 tsetdirt(i, i);
1330                                 break;
1331                         }
1332                 }
1333         }
1334 }
1335
1336 void
1337 tfulldirt(void) {
1338         tsetdirt(0, term.row-1);
1339 }
1340
1341 void
1342 tcursor(int mode) {
1343         static TCursor c[2];
1344         bool alt = IS_SET(MODE_ALTSCREEN);
1345
1346         if(mode == CURSOR_SAVE) {
1347                 c[alt] = term.c;
1348         } else if(mode == CURSOR_LOAD) {
1349                 term.c = c[alt];
1350                 tmoveto(c[alt].x, c[alt].y);
1351         }
1352 }
1353
1354 void
1355 treset(void) {
1356         uint i;
1357
1358         term.c = (TCursor){{
1359                 .mode = ATTR_NULL,
1360                 .fg = defaultfg,
1361                 .bg = defaultbg
1362         }, .x = 0, .y = 0, .state = CURSOR_DEFAULT};
1363
1364         memset(term.tabs, 0, term.col * sizeof(*term.tabs));
1365         for(i = tabspaces; i < term.col; i += tabspaces)
1366                 term.tabs[i] = 1;
1367         term.top = 0;
1368         term.bot = term.row - 1;
1369         term.mode = MODE_WRAP;
1370         memset(term.trantbl, sizeof(term.trantbl), CS_USA);
1371         term.charset = 0;
1372
1373         tclearregion(0, 0, term.col-1, term.row-1);
1374         tmoveto(0, 0);
1375         tcursor(CURSOR_SAVE);
1376 }
1377
1378 void
1379 tnew(int col, int row) {
1380         term = (Term){ .c = { .attr = { .fg = defaultfg, .bg = defaultbg } } };
1381         tresize(col, row);
1382         term.numlock = 1;
1383
1384         treset();
1385 }
1386
1387 void
1388 tswapscreen(void) {
1389         Line *tmp = term.line;
1390
1391         term.line = term.alt;
1392         term.alt = tmp;
1393         term.mode ^= MODE_ALTSCREEN;
1394         tfulldirt();
1395 }
1396
1397 void
1398 tscrolldown(int orig, int n) {
1399         int i;
1400         Line temp;
1401
1402         LIMIT(n, 0, term.bot-orig+1);
1403
1404         tsetdirt(orig, term.bot-n);
1405         tclearregion(0, term.bot-n+1, term.col-1, term.bot);
1406
1407         for(i = term.bot; i >= orig+n; i--) {
1408                 temp = term.line[i];
1409                 term.line[i] = term.line[i-n];
1410                 term.line[i-n] = temp;
1411         }
1412
1413         selscroll(orig, n);
1414 }
1415
1416 void
1417 tscrollup(int orig, int n) {
1418         int i;
1419         Line temp;
1420
1421         LIMIT(n, 0, term.bot-orig+1);
1422
1423         tclearregion(0, orig, term.col-1, orig+n-1);
1424         tsetdirt(orig+n, term.bot);
1425
1426         for(i = orig; i <= term.bot-n; i++) {
1427                 temp = term.line[i];
1428                 term.line[i] = term.line[i+n];
1429                 term.line[i+n] = temp;
1430         }
1431
1432         selscroll(orig, -n);
1433 }
1434
1435 void
1436 selscroll(int orig, int n) {
1437         if(sel.ob.x == -1)
1438                 return;
1439
1440         if(BETWEEN(sel.ob.y, orig, term.bot) || BETWEEN(sel.oe.y, orig, term.bot)) {
1441                 if((sel.ob.y += n) > term.bot || (sel.oe.y += n) < term.top) {
1442                         selclear(NULL);
1443                         return;
1444                 }
1445                 if(sel.type == SEL_RECTANGULAR) {
1446                         if(sel.ob.y < term.top)
1447                                 sel.ob.y = term.top;
1448                         if(sel.oe.y > term.bot)
1449                                 sel.oe.y = term.bot;
1450                 } else {
1451                         if(sel.ob.y < term.top) {
1452                                 sel.ob.y = term.top;
1453                                 sel.ob.x = 0;
1454                         }
1455                         if(sel.oe.y > term.bot) {
1456                                 sel.oe.y = term.bot;
1457                                 sel.oe.x = term.col;
1458                         }
1459                 }
1460                 selnormalize();
1461         }
1462 }
1463
1464 void
1465 tnewline(int first_col) {
1466         int y = term.c.y;
1467
1468         if(y == term.bot) {
1469                 tscrollup(term.top, 1);
1470         } else {
1471                 y++;
1472         }
1473         tmoveto(first_col ? 0 : term.c.x, y);
1474 }
1475
1476 void
1477 csiparse(void) {
1478         char *p = csiescseq.buf, *np;
1479         long int v;
1480
1481         csiescseq.narg = 0;
1482         if(*p == '?') {
1483                 csiescseq.priv = 1;
1484                 p++;
1485         }
1486
1487         csiescseq.buf[csiescseq.len] = '\0';
1488         while(p < csiescseq.buf+csiescseq.len) {
1489                 np = NULL;
1490                 v = strtol(p, &np, 10);
1491                 if(np == p)
1492                         v = 0;
1493                 if(v == LONG_MAX || v == LONG_MIN)
1494                         v = -1;
1495                 csiescseq.arg[csiescseq.narg++] = v;
1496                 p = np;
1497                 if(*p != ';' || csiescseq.narg == ESC_ARG_SIZ)
1498                         break;
1499                 p++;
1500         }
1501         csiescseq.mode = *p;
1502 }
1503
1504 /* for absolute user moves, when decom is set */
1505 void
1506 tmoveato(int x, int y) {
1507         tmoveto(x, y + ((term.c.state & CURSOR_ORIGIN) ? term.top: 0));
1508 }
1509
1510 void
1511 tmoveto(int x, int y) {
1512         int miny, maxy;
1513
1514         if(term.c.state & CURSOR_ORIGIN) {
1515                 miny = term.top;
1516                 maxy = term.bot;
1517         } else {
1518                 miny = 0;
1519                 maxy = term.row - 1;
1520         }
1521         LIMIT(x, 0, term.col-1);
1522         LIMIT(y, miny, maxy);
1523         term.c.state &= ~CURSOR_WRAPNEXT;
1524         term.c.x = x;
1525         term.c.y = y;
1526 }
1527
1528 void
1529 tsetchar(char *c, Glyph *attr, int x, int y) {
1530         static char *vt100_0[62] = { /* 0x41 - 0x7e */
1531                 "↑", "↓", "→", "←", "█", "▚", "☃", /* A - G */
1532                 0, 0, 0, 0, 0, 0, 0, 0, /* H - O */
1533                 0, 0, 0, 0, 0, 0, 0, 0, /* P - W */
1534                 0, 0, 0, 0, 0, 0, 0, " ", /* X - _ */
1535                 "◆", "▒", "␉", "␌", "␍", "␊", "°", "±", /* ` - g */
1536                 "␤", "␋", "┘", "┐", "┌", "└", "┼", "⎺", /* h - o */
1537                 "⎻", "─", "⎼", "⎽", "├", "┤", "┴", "┬", /* p - w */
1538                 "│", "≤", "≥", "π", "≠", "£", "·", /* x - ~ */
1539         };
1540
1541         /*
1542          * The table is proudly stolen from rxvt.
1543          */
1544         if(term.trantbl[term.charset] == CS_GRAPHIC0) {
1545                 if(BETWEEN(c[0], 0x41, 0x7e) && vt100_0[c[0] - 0x41]) {
1546                         c = vt100_0[c[0] - 0x41];
1547                 }
1548         }
1549
1550         if(term.line[y][x].mode & ATTR_WIDE) {
1551                 if(x+1 < term.col) {
1552                         term.line[y][x+1].c[0] = ' ';
1553                         term.line[y][x+1].mode &= ~ATTR_WDUMMY;
1554                 }
1555         } else if(term.line[y][x].mode & ATTR_WDUMMY) {
1556                 term.line[y][x-1].c[0] = ' ';
1557                 term.line[y][x-1].mode &= ~ATTR_WIDE;
1558         }
1559
1560         term.dirty[y] = 1;
1561         term.line[y][x] = *attr;
1562         memcpy(term.line[y][x].c, c, UTF_SIZ);
1563 }
1564
1565 void
1566 tclearregion(int x1, int y1, int x2, int y2) {
1567         int x, y, temp;
1568
1569         if(x1 > x2)
1570                 temp = x1, x1 = x2, x2 = temp;
1571         if(y1 > y2)
1572                 temp = y1, y1 = y2, y2 = temp;
1573
1574         LIMIT(x1, 0, term.col-1);
1575         LIMIT(x2, 0, term.col-1);
1576         LIMIT(y1, 0, term.row-1);
1577         LIMIT(y2, 0, term.row-1);
1578
1579         for(y = y1; y <= y2; y++) {
1580                 term.dirty[y] = 1;
1581                 for(x = x1; x <= x2; x++) {
1582                         if(selected(x, y))
1583                                 selclear(NULL);
1584                         term.line[y][x] = term.c.attr;
1585                         memcpy(term.line[y][x].c, " ", 2);
1586                 }
1587         }
1588 }
1589
1590 void
1591 tdeletechar(int n) {
1592         int dst, src, size;
1593         Glyph *line;
1594
1595         LIMIT(n, 0, term.col - term.c.x);
1596
1597         dst = term.c.x;
1598         src = term.c.x + n;
1599         size = term.col - src;
1600         line = term.line[term.c.y];
1601
1602         memmove(&line[dst], &line[src], size * sizeof(Glyph));
1603         tclearregion(term.col-n, term.c.y, term.col-1, term.c.y);
1604 }
1605
1606 void
1607 tinsertblank(int n) {
1608         int dst, src, size;
1609         Glyph *line;
1610
1611         LIMIT(n, 0, term.col - term.c.x);
1612
1613         dst = term.c.x + n;
1614         src = term.c.x;
1615         size = term.col - dst;
1616         line = term.line[term.c.y];
1617
1618         memmove(&line[dst], &line[src], size * sizeof(Glyph));
1619         tclearregion(src, term.c.y, dst - 1, term.c.y);
1620 }
1621
1622 void
1623 tinsertblankline(int n) {
1624         if(BETWEEN(term.c.y, term.top, term.bot))
1625                 tscrolldown(term.c.y, n);
1626 }
1627
1628 void
1629 tdeleteline(int n) {
1630         if(BETWEEN(term.c.y, term.top, term.bot))
1631                 tscrollup(term.c.y, n);
1632 }
1633
1634 int32_t
1635 tdefcolor(int *attr, int *npar, int l) {
1636         int32_t idx = -1;
1637         uint r, g, b;
1638
1639         switch (attr[*npar + 1]) {
1640         case 2: /* direct color in RGB space */
1641                 if (*npar + 4 >= l) {
1642                         fprintf(stderr,
1643                                 "erresc(38): Incorrect number of parameters (%d)\n",
1644                                 *npar);
1645                         break;
1646                 }
1647                 r = attr[*npar + 2];
1648                 g = attr[*npar + 3];
1649                 b = attr[*npar + 4];
1650                 *npar += 4;
1651                 if(!BETWEEN(r, 0, 255) || !BETWEEN(g, 0, 255) || !BETWEEN(b, 0, 255))
1652                         fprintf(stderr, "erresc: bad rgb color (%d,%d,%d)\n",
1653                                 r, g, b);
1654                 else
1655                         idx = TRUECOLOR(r, g, b);
1656                 break;
1657         case 5: /* indexed color */
1658                 if (*npar + 2 >= l) {
1659                         fprintf(stderr,
1660                                 "erresc(38): Incorrect number of parameters (%d)\n",
1661                                 *npar);
1662                         break;
1663                 }
1664                 *npar += 2;
1665                 if(!BETWEEN(attr[*npar], 0, 255))
1666                         fprintf(stderr, "erresc: bad fgcolor %d\n", attr[*npar]);
1667                 else
1668                         idx = attr[*npar];
1669                 break;
1670         case 0: /* implemented defined (only foreground) */
1671         case 1: /* transparent */
1672         case 3: /* direct color in CMY space */
1673         case 4: /* direct color in CMYK space */
1674         default:
1675                 fprintf(stderr,
1676                         "erresc(38): gfx attr %d unknown\n", attr[*npar]);
1677                 break;
1678         }
1679
1680         return idx;
1681 }
1682
1683 void
1684 tsetattr(int *attr, int l) {
1685         int i;
1686         int32_t idx;
1687
1688         for(i = 0; i < l; i++) {
1689                 switch(attr[i]) {
1690                 case 0:
1691                         term.c.attr.mode &= ~(ATTR_REVERSE | ATTR_UNDERLINE \
1692                                         | ATTR_BOLD | ATTR_ITALIC \
1693                                         | ATTR_BLINK);
1694                         term.c.attr.fg = defaultfg;
1695                         term.c.attr.bg = defaultbg;
1696                         break;
1697                 case 1:
1698                         term.c.attr.mode |= ATTR_BOLD;
1699                         break;
1700                 case 3:
1701                         term.c.attr.mode |= ATTR_ITALIC;
1702                         break;
1703                 case 4:
1704                         term.c.attr.mode |= ATTR_UNDERLINE;
1705                         break;
1706                 case 5: /* slow blink */
1707                 case 6: /* rapid blink */
1708                         term.c.attr.mode |= ATTR_BLINK;
1709                         break;
1710                 case 7:
1711                         term.c.attr.mode |= ATTR_REVERSE;
1712                         break;
1713                 case 21:
1714                 case 22:
1715                         term.c.attr.mode &= ~ATTR_BOLD;
1716                         break;
1717                 case 23:
1718                         term.c.attr.mode &= ~ATTR_ITALIC;
1719                         break;
1720                 case 24:
1721                         term.c.attr.mode &= ~ATTR_UNDERLINE;
1722                         break;
1723                 case 25:
1724                 case 26:
1725                         term.c.attr.mode &= ~ATTR_BLINK;
1726                         break;
1727                 case 27:
1728                         term.c.attr.mode &= ~ATTR_REVERSE;
1729                         break;
1730                 case 38:
1731                         if ((idx = tdefcolor(attr, &i, l)) >= 0)
1732                                 term.c.attr.fg = idx;
1733                         break;
1734                 case 39:
1735                         term.c.attr.fg = defaultfg;
1736                         break;
1737                 case 48:
1738                         if ((idx = tdefcolor(attr, &i, l)) >= 0)
1739                                 term.c.attr.bg = idx;
1740                         break;
1741                 case 49:
1742                         term.c.attr.bg = defaultbg;
1743                         break;
1744                 default:
1745                         if(BETWEEN(attr[i], 30, 37)) {
1746                                 term.c.attr.fg = attr[i] - 30;
1747                         } else if(BETWEEN(attr[i], 40, 47)) {
1748                                 term.c.attr.bg = attr[i] - 40;
1749                         } else if(BETWEEN(attr[i], 90, 97)) {
1750                                 term.c.attr.fg = attr[i] - 90 + 8;
1751                         } else if(BETWEEN(attr[i], 100, 107)) {
1752                                 term.c.attr.bg = attr[i] - 100 + 8;
1753                         } else {
1754                                 fprintf(stderr,
1755                                         "erresc(default): gfx attr %d unknown\n",
1756                                         attr[i]), csidump();
1757                         }
1758                         break;
1759                 }
1760         }
1761 }
1762
1763 void
1764 tsetscroll(int t, int b) {
1765         int temp;
1766
1767         LIMIT(t, 0, term.row-1);
1768         LIMIT(b, 0, term.row-1);
1769         if(t > b) {
1770                 temp = t;
1771                 t = b;
1772                 b = temp;
1773         }
1774         term.top = t;
1775         term.bot = b;
1776 }
1777
1778 void
1779 tsetmode(bool priv, bool set, int *args, int narg) {
1780         int *lim, mode;
1781         bool alt;
1782
1783         for(lim = args + narg; args < lim; ++args) {
1784                 if(priv) {
1785                         switch(*args) {
1786                         case 1: /* DECCKM -- Cursor key */
1787                                 MODBIT(term.mode, set, MODE_APPCURSOR);
1788                                 break;
1789                         case 5: /* DECSCNM -- Reverse video */
1790                                 mode = term.mode;
1791                                 MODBIT(term.mode, set, MODE_REVERSE);
1792                                 if(mode != term.mode)
1793                                         redraw(REDRAW_TIMEOUT);
1794                                 break;
1795                         case 6: /* DECOM -- Origin */
1796                                 MODBIT(term.c.state, set, CURSOR_ORIGIN);
1797                                 tmoveato(0, 0);
1798                                 break;
1799                         case 7: /* DECAWM -- Auto wrap */
1800                                 MODBIT(term.mode, set, MODE_WRAP);
1801                                 break;
1802                         case 0:  /* Error (IGNORED) */
1803                         case 2:  /* DECANM -- ANSI/VT52 (IGNORED) */
1804                         case 3:  /* DECCOLM -- Column  (IGNORED) */
1805                         case 4:  /* DECSCLM -- Scroll (IGNORED) */
1806                         case 8:  /* DECARM -- Auto repeat (IGNORED) */
1807                         case 18: /* DECPFF -- Printer feed (IGNORED) */
1808                         case 19: /* DECPEX -- Printer extent (IGNORED) */
1809                         case 42: /* DECNRCM -- National characters (IGNORED) */
1810                         case 12: /* att610 -- Start blinking cursor (IGNORED) */
1811                                 break;
1812                         case 25: /* DECTCEM -- Text Cursor Enable Mode */
1813                                 MODBIT(term.mode, !set, MODE_HIDE);
1814                                 break;
1815                         case 9:    /* X10 mouse compatibility mode */
1816                                 xsetpointermotion(0);
1817                                 MODBIT(term.mode, 0, MODE_MOUSE);
1818                                 MODBIT(term.mode, set, MODE_MOUSEX10);
1819                                 break;
1820                         case 1000: /* 1000: report button press */
1821                                 xsetpointermotion(0);
1822                                 MODBIT(term.mode, 0, MODE_MOUSE);
1823                                 MODBIT(term.mode, set, MODE_MOUSEBTN);
1824                                 break;
1825                         case 1002: /* 1002: report motion on button press */
1826                                 xsetpointermotion(0);
1827                                 MODBIT(term.mode, 0, MODE_MOUSE);
1828                                 MODBIT(term.mode, set, MODE_MOUSEMOTION);
1829                                 break;
1830                         case 1003: /* 1003: enable all mouse motions */
1831                                 xsetpointermotion(set);
1832                                 MODBIT(term.mode, 0, MODE_MOUSE);
1833                                 MODBIT(term.mode, set, MODE_MOUSEMANY);
1834                                 break;
1835                         case 1004: /* 1004: send focus events to tty */
1836                                 MODBIT(term.mode, set, MODE_FOCUS);
1837                                 break;
1838                         case 1006: /* 1006: extended reporting mode */
1839                                 MODBIT(term.mode, set, MODE_MOUSESGR);
1840                                 break;
1841                         case 1034:
1842                                 MODBIT(term.mode, set, MODE_8BIT);
1843                                 break;
1844                         case 1049: /* swap screen & set/restore cursor as xterm */
1845                                 if (!allowaltscreen)
1846                                         break;
1847                                 tcursor((set) ? CURSOR_SAVE : CURSOR_LOAD);
1848                                 /* FALLTHROUGH */
1849                         case 47: /* swap screen */
1850                         case 1047:
1851                                 if (!allowaltscreen)
1852                                         break;
1853                                 alt = IS_SET(MODE_ALTSCREEN);
1854                                 if(alt) {
1855                                         tclearregion(0, 0, term.col-1,
1856                                                         term.row-1);
1857                                 }
1858                                 if(set ^ alt) /* set is always 1 or 0 */
1859                                         tswapscreen();
1860                                 if(*args != 1049)
1861                                         break;
1862                                 /* FALLTHROUGH */
1863                         case 1048:
1864                                 tcursor((set) ? CURSOR_SAVE : CURSOR_LOAD);
1865                                 break;
1866                         case 2004: /* 2004: bracketed paste mode */
1867                                 MODBIT(term.mode, set, MODE_BRCKTPASTE);
1868                                 break;
1869                         /* Not implemented mouse modes. See comments there. */
1870                         case 1001: /* mouse highlight mode; can hang the
1871                                       terminal by design when implemented. */
1872                         case 1005: /* UTF-8 mouse mode; will confuse
1873                                       applications not supporting UTF-8
1874                                       and luit. */
1875                         case 1015: /* urxvt mangled mouse mode; incompatible
1876                                       and can be mistaken for other control
1877                                       codes. */
1878                         default:
1879                                 fprintf(stderr,
1880                                         "erresc: unknown private set/reset mode %d\n",
1881                                         *args);
1882                                 break;
1883                         }
1884                 } else {
1885                         switch(*args) {
1886                         case 0:  /* Error (IGNORED) */
1887                                 break;
1888                         case 2:  /* KAM -- keyboard action */
1889                                 MODBIT(term.mode, set, MODE_KBDLOCK);
1890                                 break;
1891                         case 4:  /* IRM -- Insertion-replacement */
1892                                 MODBIT(term.mode, set, MODE_INSERT);
1893                                 break;
1894                         case 12: /* SRM -- Send/Receive */
1895                                 MODBIT(term.mode, !set, MODE_ECHO);
1896                                 break;
1897                         case 20: /* LNM -- Linefeed/new line */
1898                                 MODBIT(term.mode, set, MODE_CRLF);
1899                                 break;
1900                         default:
1901                                 fprintf(stderr,
1902                                         "erresc: unknown set/reset mode %d\n",
1903                                         *args);
1904                                 break;
1905                         }
1906                 }
1907         }
1908 }
1909
1910 void
1911 csihandle(void) {
1912         char buf[40];
1913         int len;
1914
1915         switch(csiescseq.mode) {
1916         default:
1917         unknown:
1918                 fprintf(stderr, "erresc: unknown csi ");
1919                 csidump();
1920                 /* die(""); */
1921                 break;
1922         case '@': /* ICH -- Insert <n> blank char */
1923                 DEFAULT(csiescseq.arg[0], 1);
1924                 tinsertblank(csiescseq.arg[0]);
1925                 break;
1926         case 'A': /* CUU -- Cursor <n> Up */
1927                 DEFAULT(csiescseq.arg[0], 1);
1928                 tmoveto(term.c.x, term.c.y-csiescseq.arg[0]);
1929                 break;
1930         case 'B': /* CUD -- Cursor <n> Down */
1931         case 'e': /* VPR --Cursor <n> Down */
1932                 DEFAULT(csiescseq.arg[0], 1);
1933                 tmoveto(term.c.x, term.c.y+csiescseq.arg[0]);
1934                 break;
1935         case 'i': /* MC -- Media Copy */
1936                 switch(csiescseq.arg[0]) {
1937                 case 0:
1938                         tdump();
1939                         break;
1940                 case 1:
1941                         tdumpline(term.c.y);
1942                         break;
1943                 case 2:
1944                         tdumpsel();
1945                         break;
1946                 case 4:
1947                         term.mode &= ~MODE_PRINT;
1948                         break;
1949                 case 5:
1950                         term.mode |= MODE_PRINT;
1951                         break;
1952                 }
1953                 break;
1954         case 'c': /* DA -- Device Attributes */
1955                 if(csiescseq.arg[0] == 0)
1956                         ttywrite(VT102ID, sizeof(VT102ID) - 1);
1957                 break;
1958         case 'C': /* CUF -- Cursor <n> Forward */
1959         case 'a': /* HPR -- Cursor <n> Forward */
1960                 DEFAULT(csiescseq.arg[0], 1);
1961                 tmoveto(term.c.x+csiescseq.arg[0], term.c.y);
1962                 break;
1963         case 'D': /* CUB -- Cursor <n> Backward */
1964                 DEFAULT(csiescseq.arg[0], 1);
1965                 tmoveto(term.c.x-csiescseq.arg[0], term.c.y);
1966                 break;
1967         case 'E': /* CNL -- Cursor <n> Down and first col */
1968                 DEFAULT(csiescseq.arg[0], 1);
1969                 tmoveto(0, term.c.y+csiescseq.arg[0]);
1970                 break;
1971         case 'F': /* CPL -- Cursor <n> Up and first col */
1972                 DEFAULT(csiescseq.arg[0], 1);
1973                 tmoveto(0, term.c.y-csiescseq.arg[0]);
1974                 break;
1975         case 'g': /* TBC -- Tabulation clear */
1976                 switch(csiescseq.arg[0]) {
1977                 case 0: /* clear current tab stop */
1978                         term.tabs[term.c.x] = 0;
1979                         break;
1980                 case 3: /* clear all the tabs */
1981                         memset(term.tabs, 0, term.col * sizeof(*term.tabs));
1982                         break;
1983                 default:
1984                         goto unknown;
1985                 }
1986                 break;
1987         case 'G': /* CHA -- Move to <col> */
1988         case '`': /* HPA */
1989                 DEFAULT(csiescseq.arg[0], 1);
1990                 tmoveto(csiescseq.arg[0]-1, term.c.y);
1991                 break;
1992         case 'H': /* CUP -- Move to <row> <col> */
1993         case 'f': /* HVP */
1994                 DEFAULT(csiescseq.arg[0], 1);
1995                 DEFAULT(csiescseq.arg[1], 1);
1996                 tmoveato(csiescseq.arg[1]-1, csiescseq.arg[0]-1);
1997                 break;
1998         case 'I': /* CHT -- Cursor Forward Tabulation <n> tab stops */
1999                 DEFAULT(csiescseq.arg[0], 1);
2000                 tputtab(csiescseq.arg[0]);
2001                 break;
2002         case 'J': /* ED -- Clear screen */
2003                 selclear(NULL);
2004                 switch(csiescseq.arg[0]) {
2005                 case 0: /* below */
2006                         tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
2007                         if(term.c.y < term.row-1) {
2008                                 tclearregion(0, term.c.y+1, term.col-1,
2009                                                 term.row-1);
2010                         }
2011                         break;
2012                 case 1: /* above */
2013                         if(term.c.y > 1)
2014                                 tclearregion(0, 0, term.col-1, term.c.y-1);
2015                         tclearregion(0, term.c.y, term.c.x, term.c.y);
2016                         break;
2017                 case 2: /* all */
2018                         tclearregion(0, 0, term.col-1, term.row-1);
2019                         break;
2020                 default:
2021                         goto unknown;
2022                 }
2023                 break;
2024         case 'K': /* EL -- Clear line */
2025                 switch(csiescseq.arg[0]) {
2026                 case 0: /* right */
2027                         tclearregion(term.c.x, term.c.y, term.col-1,
2028                                         term.c.y);
2029                         break;
2030                 case 1: /* left */
2031                         tclearregion(0, term.c.y, term.c.x, term.c.y);
2032                         break;
2033                 case 2: /* all */
2034                         tclearregion(0, term.c.y, term.col-1, term.c.y);
2035                         break;
2036                 }
2037                 break;
2038         case 'S': /* SU -- Scroll <n> line up */
2039                 DEFAULT(csiescseq.arg[0], 1);
2040                 tscrollup(term.top, csiescseq.arg[0]);
2041                 break;
2042         case 'T': /* SD -- Scroll <n> line down */
2043                 DEFAULT(csiescseq.arg[0], 1);
2044                 tscrolldown(term.top, csiescseq.arg[0]);
2045                 break;
2046         case 'L': /* IL -- Insert <n> blank lines */
2047                 DEFAULT(csiescseq.arg[0], 1);
2048                 tinsertblankline(csiescseq.arg[0]);
2049                 break;
2050         case 'l': /* RM -- Reset Mode */
2051                 tsetmode(csiescseq.priv, 0, csiescseq.arg, csiescseq.narg);
2052                 break;
2053         case 'M': /* DL -- Delete <n> lines */
2054                 DEFAULT(csiescseq.arg[0], 1);
2055                 tdeleteline(csiescseq.arg[0]);
2056                 break;
2057         case 'X': /* ECH -- Erase <n> char */
2058                 DEFAULT(csiescseq.arg[0], 1);
2059                 tclearregion(term.c.x, term.c.y,
2060                                 term.c.x + csiescseq.arg[0] - 1, term.c.y);
2061                 break;
2062         case 'P': /* DCH -- Delete <n> char */
2063                 DEFAULT(csiescseq.arg[0], 1);
2064                 tdeletechar(csiescseq.arg[0]);
2065                 break;
2066         case 'Z': /* CBT -- Cursor Backward Tabulation <n> tab stops */
2067                 DEFAULT(csiescseq.arg[0], 1);
2068                 tputtab(-csiescseq.arg[0]);
2069                 break;
2070         case 'd': /* VPA -- Move to <row> */
2071                 DEFAULT(csiescseq.arg[0], 1);
2072                 tmoveato(term.c.x, csiescseq.arg[0]-1);
2073                 break;
2074         case 'h': /* SM -- Set terminal mode */
2075                 tsetmode(csiescseq.priv, 1, csiescseq.arg, csiescseq.narg);
2076                 break;
2077         case 'm': /* SGR -- Terminal attribute (color) */
2078                 tsetattr(csiescseq.arg, csiescseq.narg);
2079                 break;
2080         case 'n': /* DSR – Device Status Report (cursor position) */
2081                 if (csiescseq.arg[0] == 6) {
2082                         len = snprintf(buf, sizeof(buf),"\033[%i;%iR",
2083                                         term.c.y+1, term.c.x+1);
2084                         ttywrite(buf, len);
2085                 }
2086                 break;
2087         case 'r': /* DECSTBM -- Set Scrolling Region */
2088                 if(csiescseq.priv) {
2089                         goto unknown;
2090                 } else {
2091                         DEFAULT(csiescseq.arg[0], 1);
2092                         DEFAULT(csiescseq.arg[1], term.row);
2093                         tsetscroll(csiescseq.arg[0]-1, csiescseq.arg[1]-1);
2094                         tmoveato(0, 0);
2095                 }
2096                 break;
2097         case 's': /* DECSC -- Save cursor position (ANSI.SYS) */
2098                 tcursor(CURSOR_SAVE);
2099                 break;
2100         case 'u': /* DECRC -- Restore cursor position (ANSI.SYS) */
2101                 tcursor(CURSOR_LOAD);
2102                 break;
2103         }
2104 }
2105
2106 void
2107 csidump(void) {
2108         int i;
2109         uint c;
2110
2111         printf("ESC[");
2112         for(i = 0; i < csiescseq.len; i++) {
2113                 c = csiescseq.buf[i] & 0xff;
2114                 if(isprint(c)) {
2115                         putchar(c);
2116                 } else if(c == '\n') {
2117                         printf("(\\n)");
2118                 } else if(c == '\r') {
2119                         printf("(\\r)");
2120                 } else if(c == 0x1b) {
2121                         printf("(\\e)");
2122                 } else {
2123                         printf("(%02x)", c);
2124                 }
2125         }
2126         putchar('\n');
2127 }
2128
2129 void
2130 csireset(void) {
2131         memset(&csiescseq, 0, sizeof(csiescseq));
2132 }
2133
2134 void
2135 strhandle(void) {
2136         char *p = NULL;
2137         int j, narg, par;
2138
2139         term.esc &= ~(ESC_STR_END|ESC_STR);
2140         strparse();
2141         narg = strescseq.narg;
2142         par = atoi(strescseq.args[0]);
2143
2144         switch(strescseq.type) {
2145         case ']': /* OSC -- Operating System Command */
2146                 switch(par) {
2147                 case 0:
2148                 case 1:
2149                 case 2:
2150                         if(narg > 1)
2151                                 xsettitle(strescseq.args[1]);
2152                         return;
2153                 case 4: /* color set */
2154                         if(narg < 3)
2155                                 break;
2156                         p = strescseq.args[2];
2157                         /* FALLTHROUGH */
2158                 case 104: /* color reset, here p = NULL */
2159                         j = (narg > 1) ? atoi(strescseq.args[1]) : -1;
2160                         if(xsetcolorname(j, p)) {
2161                                 fprintf(stderr, "erresc: invalid color %s\n", p);
2162                         } else {
2163                                 /*
2164                                  * TODO if defaultbg color is changed, borders
2165                                  * are dirty
2166                                  */
2167                                 redraw(0);
2168                         }
2169                         return;
2170                 }
2171                 break;
2172         case 'k': /* old title set compatibility */
2173                 xsettitle(strescseq.args[0]);
2174                 return;
2175         case 'P': /* DCS -- Device Control String */
2176         case '_': /* APC -- Application Program Command */
2177         case '^': /* PM -- Privacy Message */
2178                 return;
2179         }
2180
2181         fprintf(stderr, "erresc: unknown str ");
2182         strdump();
2183 }
2184
2185 void
2186 strparse(void) {
2187         char *p = strescseq.buf;
2188
2189         strescseq.narg = 0;
2190         strescseq.buf[strescseq.len] = '\0';
2191         while(p && strescseq.narg < STR_ARG_SIZ)
2192                 strescseq.args[strescseq.narg++] = strsep(&p, ";");
2193 }
2194
2195 void
2196 strdump(void) {
2197         int i;
2198         uint c;
2199
2200         printf("ESC%c", strescseq.type);
2201         for(i = 0; i < strescseq.len; i++) {
2202                 c = strescseq.buf[i] & 0xff;
2203                 if(c == '\0') {
2204                         return;
2205                 } else if(isprint(c)) {
2206                         putchar(c);
2207                 } else if(c == '\n') {
2208                         printf("(\\n)");
2209                 } else if(c == '\r') {
2210                         printf("(\\r)");
2211                 } else if(c == 0x1b) {
2212                         printf("(\\e)");
2213                 } else {
2214                         printf("(%02x)", c);
2215                 }
2216         }
2217         printf("ESC\\\n");
2218 }
2219
2220 void
2221 strreset(void) {
2222         memset(&strescseq, 0, sizeof(strescseq));
2223 }
2224
2225 void
2226 tprinter(char *s, size_t len) {
2227         if(iofd != -1 && xwrite(iofd, s, len) < 0) {
2228                 fprintf(stderr, "Error writing in %s:%s\n",
2229                         opt_io, strerror(errno));
2230                 close(iofd);
2231                 iofd = -1;
2232         }
2233 }
2234
2235 void
2236 toggleprinter(const Arg *arg) {
2237         term.mode ^= MODE_PRINT;
2238 }
2239
2240 void
2241 printscreen(const Arg *arg) {
2242         tdump();
2243 }
2244
2245 void
2246 printsel(const Arg *arg) {
2247         tdumpsel();
2248 }
2249
2250 void
2251 tdumpsel(void) {
2252         char *ptr;
2253
2254         if((ptr = getsel())) {
2255                 tprinter(ptr, strlen(ptr));
2256                 free(ptr);
2257         }
2258 }
2259
2260 void
2261 tdumpline(int n) {
2262         Glyph *bp, *end;
2263
2264         bp = &term.line[n][0];
2265         end = &bp[term.col-1];
2266         while(end > bp && !strcmp(" ", end->c))
2267                 --end;
2268         if(bp != end || strcmp(bp->c, " ")) {
2269                 for( ;bp <= end; ++bp)
2270                         tprinter(bp->c, strlen(bp->c));
2271         }
2272         tprinter("\n", 1);
2273 }
2274
2275 void
2276 tdump(void) {
2277         int i;
2278
2279         for(i = 0; i < term.row; ++i)
2280                 tdumpline(i);
2281 }
2282
2283 void
2284 tputtab(int n) {
2285         uint x = term.c.x;
2286
2287         if(n > 0) {
2288                 while(x < term.col && n--)
2289                         for(++x; x < term.col && !term.tabs[x]; ++x)
2290                                 /* nothing */ ;
2291         } else if(n < 0) {
2292                 while(x > 0 && n++)
2293                         for(--x; x > 0 && !term.tabs[x]; --x)
2294                                 /* nothing */ ;
2295         }
2296         tmoveto(x, term.c.y);
2297 }
2298
2299 void
2300 techo(char *buf, int len) {
2301         for(; len > 0; buf++, len--) {
2302                 char c = *buf;
2303
2304                 if(ISCONTROL(c)) { /* control code */
2305                         if(c & 0x80) {
2306                                 c &= 0x7f;
2307                                 tputc("^", 1);
2308                                 tputc("[", 1);
2309                         } else if(c != '\n' && c != '\r' && c != '\t') {
2310                                 c ^= '\x40';
2311                                 tputc("^", 1);
2312                         }
2313                         tputc(&c, 1);
2314                 } else {
2315                         break;
2316                 }
2317         }
2318         if(len)
2319                 tputc(buf, len);
2320 }
2321
2322 void
2323 tdeftran(char ascii) {
2324         char c, (*bp)[2];
2325         static char tbl[][2] = {
2326                 {'0', CS_GRAPHIC0}, {'B', CS_USA},
2327                 {0, 0}
2328         };
2329
2330         for (bp = &tbl[0]; (c = (*bp)[0]) && c != ascii; ++bp)
2331                 /* nothing */;
2332
2333         if (c == 0)
2334                 fprintf(stderr, "esc unhandled charset: ESC ( %c\n", ascii);
2335         else
2336                 term.trantbl[term.icharset] = (*bp)[1];
2337 }
2338
2339 void
2340 tcontrolcode(uchar ascii) {
2341         static char question[UTF_SIZ] = "?";
2342
2343         switch(ascii) {
2344         case '\t':   /* HT */
2345                 tputtab(1);
2346                 return;
2347         case '\b':   /* BS */
2348                 tmoveto(term.c.x-1, term.c.y);
2349                 return;
2350         case '\r':   /* CR */
2351                 tmoveto(0, term.c.y);
2352                 return;
2353         case '\f':   /* LF */
2354         case '\v':   /* VT */
2355         case '\n':   /* LF */
2356                 /* go to first col if the mode is set */
2357                 tnewline(IS_SET(MODE_CRLF));
2358                 return;
2359         case '\a':   /* BEL */
2360                 if(term.esc & ESC_STR_END) {
2361                         /* backwards compatibility to xterm */
2362                         strhandle();
2363                 } else {
2364                         if(!(xw.state & WIN_FOCUSED))
2365                                 xseturgency(1);
2366                         if (bellvolume)
2367                                 XBell(xw.dpy, bellvolume);
2368                 }
2369                 break;
2370         case '\033': /* ESC */
2371                 csireset();
2372                 term.esc &= ~(ESC_CSI|ESC_ALTCHARSET|ESC_TEST);
2373                 term.esc |= ESC_START;
2374                 return;
2375         case '\016': /* SO */
2376                 term.charset = 0;
2377                 return;
2378         case '\017': /* SI */
2379                 term.charset = 1;
2380                 return;
2381         case '\032': /* SUB */
2382                 tsetchar(question, &term.c.attr, term.c.x, term.c.y);
2383         case '\030': /* CAN */
2384                 csireset();
2385                 break;
2386         case '\005': /* ENQ (IGNORED) */
2387         case '\000': /* NUL (IGNORED) */
2388         case '\021': /* XON (IGNORED) */
2389         case '\023': /* XOFF (IGNORED) */
2390         case 0177:   /* DEL (IGNORED) */
2391                 return;
2392         case 0x84:   /* TODO: IND */
2393         case 0x85:   /* TODO: NEL */
2394         case 0x88:   /* TODO: HTS */
2395         case 0x8d:   /* TODO: RI */
2396         case 0x8e:   /* TODO: SS2 */
2397         case 0x8f:   /* TODO: SS3 */
2398         case 0x90:   /* TODO: DCS */
2399         case 0x98:   /* TODO: SOS */
2400         case 0x9a:   /* TODO: DECID */
2401         case 0x9b:   /* TODO: CSI */
2402         case 0x9c:   /* TODO: ST */
2403         case 0x9d:   /* TODO: OSC */
2404         case 0x9e:   /* TODO: PM */
2405         case 0x9f:   /* TODO: APC */
2406                 break;
2407         }
2408         /* only CAN, SUB, \a and C1 chars interrupt a sequence */
2409         term.esc &= ~(ESC_STR_END|ESC_STR);
2410         return;
2411 }
2412
2413 void
2414 tdectest(char c) {
2415         static char E[UTF_SIZ] = "E";
2416         int x, y;
2417
2418         if(c == '8') { /* DEC screen alignment test. */
2419                 for(x = 0; x < term.col; ++x) {
2420                         for(y = 0; y < term.row; ++y)
2421                                 tsetchar(E, &term.c.attr, x, y);
2422                 }
2423         }
2424 }
2425
2426 void
2427 tputc(char *c, int len) {
2428         uchar ascii;
2429         bool control;
2430         long unicodep;
2431         int width;
2432         Glyph *gp;
2433
2434         if(len == 1) {
2435                 width = 1;
2436                 unicodep = ascii = *c;
2437         } else {
2438                 utf8decode(c, &unicodep, UTF_SIZ);
2439                 width = wcwidth(unicodep);
2440                 control = ISCONTROLC1(unicodep);
2441                 ascii = unicodep;
2442         }
2443
2444         if(IS_SET(MODE_PRINT))
2445                 tprinter(c, len);
2446         control = ISCONTROL(unicodep);
2447
2448         /*
2449          * STR sequence must be checked before anything else
2450          * because it uses all following characters until it
2451          * receives a ESC, a SUB, a ST or any other C1 control
2452          * character.
2453          */
2454         if(term.esc & ESC_STR) {
2455                 if(width == 1 &&
2456                    (ascii == '\a' || ascii == 030 ||
2457                     ascii == 032  || ascii == 033 ||
2458                     ISCONTROLC1(unicodep))) {
2459                         term.esc &= ~(ESC_START|ESC_STR);
2460                         term.esc |= ESC_STR_END;
2461                 } else if(strescseq.len + len < sizeof(strescseq.buf) - 1) {
2462                         memmove(&strescseq.buf[strescseq.len], c, len);
2463                         strescseq.len += len;
2464                         return;
2465                 } else {
2466                 /*
2467                  * Here is a bug in terminals. If the user never sends
2468                  * some code to stop the str or esc command, then st
2469                  * will stop responding. But this is better than
2470                  * silently failing with unknown characters. At least
2471                  * then users will report back.
2472                  *
2473                  * In the case users ever get fixed, here is the code:
2474                  */
2475                 /*
2476                  * term.esc = 0;
2477                  * strhandle();
2478                  */
2479                         return;
2480                 }
2481         }
2482
2483         /*
2484          * Actions of control codes must be performed as soon they arrive
2485          * because they can be embedded inside a control sequence, and
2486          * they must not cause conflicts with sequences.
2487          */
2488         if(control) {
2489                 tcontrolcode(ascii);
2490                 /*
2491                  * control codes are not shown ever
2492                  */
2493                 return;
2494         } else if(term.esc & ESC_START) {
2495                 if(term.esc & ESC_CSI) {
2496                         csiescseq.buf[csiescseq.len++] = ascii;
2497                         if(BETWEEN(ascii, 0x40, 0x7E)
2498                                         || csiescseq.len >= \
2499                                         sizeof(csiescseq.buf)-1) {
2500                                 term.esc = 0;
2501                                 csiparse();
2502                                 csihandle();
2503                         }
2504                         return;
2505                 } else if(term.esc & ESC_ALTCHARSET) {
2506                         tdeftran(ascii);
2507                 } else if(term.esc & ESC_TEST) {
2508                         tdectest(ascii);
2509                 } else {
2510                         switch(ascii) {
2511                         case '[':
2512                                 term.esc |= ESC_CSI;
2513                                 return;
2514                         case '#':
2515                                 term.esc |= ESC_TEST;
2516                                 return;
2517                         case 'P': /* DCS -- Device Control String */
2518                         case '_': /* APC -- Application Program Command */
2519                         case '^': /* PM -- Privacy Message */
2520                         case ']': /* OSC -- Operating System Command */
2521                         case 'k': /* old title set compatibility */
2522                                 strreset();
2523                                 strescseq.type = ascii;
2524                                 term.esc |= ESC_STR;
2525                                 return;
2526                         case '(': /* set primary charset G0 */
2527                         case ')': /* set secondary charset G1 */
2528                         case '*': /* set tertiary charset G2 */
2529                         case '+': /* set quaternary charset G3 */
2530                                 term.icharset = ascii - '(';
2531                                 term.esc |= ESC_ALTCHARSET;
2532                                 return;
2533                         case 'D': /* IND -- Linefeed */
2534                                 if(term.c.y == term.bot) {
2535                                         tscrollup(term.top, 1);
2536                                 } else {
2537                                         tmoveto(term.c.x, term.c.y+1);
2538                                 }
2539                                 break;
2540                         case 'E': /* NEL -- Next line */
2541                                 tnewline(1); /* always go to first col */
2542                                 break;
2543                         case 'H': /* HTS -- Horizontal tab stop */
2544                                 term.tabs[term.c.x] = 1;
2545                                 break;
2546                         case 'M': /* RI -- Reverse index */
2547                                 if(term.c.y == term.top) {
2548                                         tscrolldown(term.top, 1);
2549                                 } else {
2550                                         tmoveto(term.c.x, term.c.y-1);
2551                                 }
2552                                 break;
2553                         case 'Z': /* DECID -- Identify Terminal */
2554                                 ttywrite(VT102ID, sizeof(VT102ID) - 1);
2555                                 break;
2556                         case 'c': /* RIS -- Reset to inital state */
2557                                 treset();
2558                                 xresettitle();
2559                                 xloadcols();
2560                                 break;
2561                         case '=': /* DECPAM -- Application keypad */
2562                                 term.mode |= MODE_APPKEYPAD;
2563                                 break;
2564                         case '>': /* DECPNM -- Normal keypad */
2565                                 term.mode &= ~MODE_APPKEYPAD;
2566                                 break;
2567                         case '7': /* DECSC -- Save Cursor */
2568                                 tcursor(CURSOR_SAVE);
2569                                 break;
2570                         case '8': /* DECRC -- Restore Cursor */
2571                                 tcursor(CURSOR_LOAD);
2572                                 break;
2573                         case '\\': /* ST -- String Terminator */
2574                                 if(term.esc & ESC_STR_END)
2575                                         strhandle();
2576                                 break;
2577                         default:
2578                                 fprintf(stderr, "erresc: unknown sequence ESC 0x%02X '%c'\n",
2579                                         (uchar) ascii, isprint(ascii)? ascii:'.');
2580                                 break;
2581                         }
2582                 }
2583                 term.esc = 0;
2584                 /*
2585                  * All characters which form part of a sequence are not
2586                  * printed
2587                  */
2588                 return;
2589         }
2590         if(sel.ob.x != -1 && BETWEEN(term.c.y, sel.ob.y, sel.oe.y))
2591                 selclear(NULL);
2592
2593         gp = &term.line[term.c.y][term.c.x];
2594         if(IS_SET(MODE_WRAP) && (term.c.state & CURSOR_WRAPNEXT)) {
2595                 gp->mode |= ATTR_WRAP;
2596                 tnewline(1);
2597         }
2598
2599         if(IS_SET(MODE_INSERT) && term.c.x+1 < term.col)
2600                 memmove(gp+1, gp, (term.col - term.c.x - 1) * sizeof(Glyph));
2601
2602         if(term.c.x+width > term.col)
2603                 tnewline(1);
2604
2605         tsetchar(c, &term.c.attr, term.c.x, term.c.y);
2606
2607         if(width == 2) {
2608                 gp->mode |= ATTR_WIDE;
2609                 if(term.c.x+1 < term.col) {
2610                         gp[1].c[0] = '\0';
2611                         gp[1].mode = ATTR_WDUMMY;
2612                 }
2613         }
2614         if(term.c.x+width < term.col) {
2615                 tmoveto(term.c.x+width, term.c.y);
2616         } else {
2617                 term.c.state |= CURSOR_WRAPNEXT;
2618         }
2619 }
2620
2621 int
2622 tresize(int col, int row) {
2623         int i;
2624         int minrow = MIN(row, term.row);
2625         int mincol = MIN(col, term.col);
2626         int slide = term.c.y - row + 1;
2627         bool *bp;
2628         Line *orig;
2629         TCursor c;
2630
2631         if(col < 1 || row < 1)
2632                 return 0;
2633
2634         /* free unneeded rows */
2635         i = 0;
2636         if(slide > 0) {
2637                 /*
2638                  * slide screen to keep cursor where we expect it -
2639                  * tscrollup would work here, but we can optimize to
2640                  * memmove because we're freeing the earlier lines
2641                  */
2642                 for(/* i = 0 */; i < slide; i++) {
2643                         free(term.line[i]);
2644                         free(term.alt[i]);
2645                 }
2646                 memmove(term.line, term.line + slide, row * sizeof(Line));
2647                 memmove(term.alt, term.alt + slide, row * sizeof(Line));
2648         }
2649         for(i += row; i < term.row; i++) {
2650                 free(term.line[i]);
2651                 free(term.alt[i]);
2652         }
2653
2654         /* resize to new height */
2655         term.line = xrealloc(term.line, row * sizeof(Line));
2656         term.alt  = xrealloc(term.alt,  row * sizeof(Line));
2657         term.dirty = xrealloc(term.dirty, row * sizeof(*term.dirty));
2658         term.tabs = xrealloc(term.tabs, col * sizeof(*term.tabs));
2659
2660         /* resize each row to new width, zero-pad if needed */
2661         for(i = 0; i < minrow; i++) {
2662                 term.dirty[i] = 1;
2663                 term.line[i] = xrealloc(term.line[i], col * sizeof(Glyph));
2664                 term.alt[i]  = xrealloc(term.alt[i],  col * sizeof(Glyph));
2665         }
2666
2667         /* allocate any new rows */
2668         for(/* i == minrow */; i < row; i++) {
2669                 term.dirty[i] = 1;
2670                 term.line[i] = xmalloc(col * sizeof(Glyph));
2671                 term.alt[i] = xmalloc(col * sizeof(Glyph));
2672         }
2673         if(col > term.col) {
2674                 bp = term.tabs + term.col;
2675
2676                 memset(bp, 0, sizeof(*term.tabs) * (col - term.col));
2677                 while(--bp > term.tabs && !*bp)
2678                         /* nothing */ ;
2679                 for(bp += tabspaces; bp < term.tabs + col; bp += tabspaces)
2680                         *bp = 1;
2681         }
2682         /* update terminal size */
2683         term.col = col;
2684         term.row = row;
2685         /* reset scrolling region */
2686         tsetscroll(0, row-1);
2687         /* make use of the LIMIT in tmoveto */
2688         tmoveto(term.c.x, term.c.y);
2689         /* Clearing both screens */
2690         orig = term.line;
2691         c = term.c;
2692         do {
2693                 if(mincol < col && 0 < minrow) {
2694                         tclearregion(mincol, 0, col - 1, minrow - 1);
2695                 }
2696                 if(0 < col && minrow < row) {
2697                         tclearregion(0, minrow, col - 1, row - 1);
2698                 }
2699                 tswapscreen();
2700                 tcursor(CURSOR_LOAD);
2701         } while(orig != term.line);
2702         term.c = c;
2703
2704         return (slide > 0);
2705 }
2706
2707 void
2708 xresize(int col, int row) {
2709         xw.tw = MAX(1, col * xw.cw);
2710         xw.th = MAX(1, row * xw.ch);
2711
2712         XFreePixmap(xw.dpy, xw.buf);
2713         xw.buf = XCreatePixmap(xw.dpy, xw.win, xw.w, xw.h,
2714                         DefaultDepth(xw.dpy, xw.scr));
2715         XftDrawChange(xw.draw, xw.buf);
2716         xclear(0, 0, xw.w, xw.h);
2717 }
2718
2719 static inline ushort
2720 sixd_to_16bit(int x) {
2721         return x == 0 ? 0 : 0x3737 + 0x2828 * x;
2722 }
2723
2724 void
2725 xloadcols(void) {
2726         int i;
2727         XRenderColor color = { .alpha = 0xffff };
2728         static bool loaded;
2729         Color *cp;
2730
2731         if(loaded) {
2732                 for (cp = dc.col; cp < dc.col + LEN(dc.col); ++cp)
2733                         XftColorFree(xw.dpy, xw.vis, xw.cmap, cp);
2734         }
2735
2736         /* load colors [0-15] and [256-LEN(colorname)] (config.h) */
2737         for(i = 0; i < LEN(colorname); i++) {
2738                 if(!colorname[i])
2739                         continue;
2740                 if(!XftColorAllocName(xw.dpy, xw.vis, xw.cmap, colorname[i], &dc.col[i])) {
2741                         die("Could not allocate color '%s'\n", colorname[i]);
2742                 }
2743         }
2744
2745         /* load colors [16-231] ; same colors as xterm */
2746         for(i = 16; i < 6*6*6+16; i++) {
2747                 color.red   = sixd_to_16bit( ((i-16)/36)%6 );
2748                 color.green = sixd_to_16bit( ((i-16)/6) %6 );
2749                 color.blue  = sixd_to_16bit( ((i-16)/1) %6 );
2750                 if(!XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &color, &dc.col[i]))
2751                         die("Could not allocate color %d\n", i);
2752         }
2753
2754         /* load colors [232-255] ; grayscale */
2755         for(; i < 256; i++) {
2756                 color.red = color.green = color.blue = 0x0808 + 0x0a0a * (i-(6*6*6+16));
2757                 if(!XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &color, &dc.col[i]))
2758                         die("Could not allocate color %d\n", i);
2759         }
2760         loaded = true;
2761 }
2762
2763 int
2764 xsetcolorname(int x, const char *name) {
2765         XRenderColor color = { .alpha = 0xffff };
2766         Color ncolor;
2767
2768         if(!BETWEEN(x, 0, LEN(colorname)))
2769                 return 1;
2770
2771         if(!name) {
2772                 if(BETWEEN(x, 16, 16 + 215)) { /* 256 color */
2773                         color.red   = sixd_to_16bit( ((x-16)/36)%6 );
2774                         color.green = sixd_to_16bit( ((x-16)/6) %6 );
2775                         color.blue  = sixd_to_16bit( ((x-16)/1) %6 );
2776                         if(!XftColorAllocValue(xw.dpy, xw.vis,
2777                                                 xw.cmap, &color, &ncolor)) {
2778                                 return 1;
2779                         }
2780
2781                         XftColorFree(xw.dpy, xw.vis, xw.cmap, &dc.col[x]);
2782                         dc.col[x] = ncolor;
2783                         return 0;
2784                 } else if(BETWEEN(x, 16 + 216, 255)) { /* greyscale */
2785                         color.red = color.green = color.blue = \
2786                                     0x0808 + 0x0a0a * (x - (16 + 216));
2787                         if(!XftColorAllocValue(xw.dpy, xw.vis,
2788                                                 xw.cmap, &color, &ncolor)) {
2789                                 return 1;
2790                         }
2791
2792                         XftColorFree(xw.dpy, xw.vis, xw.cmap, &dc.col[x]);
2793                         dc.col[x] = ncolor;
2794                         return 0;
2795                 } else { /* system colors */
2796                         name = colorname[x];
2797                 }
2798         }
2799         if(!XftColorAllocName(xw.dpy, xw.vis, xw.cmap, name, &ncolor))
2800                 return 1;
2801
2802         XftColorFree(xw.dpy, xw.vis, xw.cmap, &dc.col[x]);
2803         dc.col[x] = ncolor;
2804         return 0;
2805 }
2806
2807 void
2808 xtermclear(int col1, int row1, int col2, int row2) {
2809         XftDrawRect(xw.draw,
2810                         &dc.col[IS_SET(MODE_REVERSE) ? defaultfg : defaultbg],
2811                         borderpx + col1 * xw.cw,
2812                         borderpx + row1 * xw.ch,
2813                         (col2-col1+1) * xw.cw,
2814                         (row2-row1+1) * xw.ch);
2815 }
2816
2817 /*
2818  * Absolute coordinates.
2819  */
2820 void
2821 xclear(int x1, int y1, int x2, int y2) {
2822         XftDrawRect(xw.draw,
2823                         &dc.col[IS_SET(MODE_REVERSE)? defaultfg : defaultbg],
2824                         x1, y1, x2-x1, y2-y1);
2825 }
2826
2827 void
2828 xhints(void) {
2829         XClassHint class = {opt_class ? opt_class : termname, termname};
2830         XWMHints wm = {.flags = InputHint, .input = 1};
2831         XSizeHints *sizeh = NULL;
2832
2833         sizeh = XAllocSizeHints();
2834
2835         sizeh->flags = PSize | PResizeInc | PBaseSize;
2836         sizeh->height = xw.h;
2837         sizeh->width = xw.w;
2838         sizeh->height_inc = xw.ch;
2839         sizeh->width_inc = xw.cw;
2840         sizeh->base_height = 2 * borderpx;
2841         sizeh->base_width = 2 * borderpx;
2842         if(xw.isfixed == True) {
2843                 sizeh->flags |= PMaxSize | PMinSize;
2844                 sizeh->min_width = sizeh->max_width = xw.w;
2845                 sizeh->min_height = sizeh->max_height = xw.h;
2846         }
2847         if(xw.gm & (XValue|YValue)) {
2848                 sizeh->flags |= USPosition | PWinGravity;
2849                 sizeh->x = xw.l;
2850                 sizeh->y = xw.t;
2851                 sizeh->win_gravity = xgeommasktogravity(xw.gm);
2852         }
2853
2854         XSetWMProperties(xw.dpy, xw.win, NULL, NULL, NULL, 0, sizeh, &wm,
2855                         &class);
2856         XFree(sizeh);
2857 }
2858
2859 int
2860 xgeommasktogravity(int mask) {
2861         switch(mask & (XNegative|YNegative)) {
2862         case 0:
2863                 return NorthWestGravity;
2864         case XNegative:
2865                 return NorthEastGravity;
2866         case YNegative:
2867                 return SouthWestGravity;
2868         }
2869         return SouthEastGravity;
2870 }
2871
2872 int
2873 xloadfont(Font *f, FcPattern *pattern) {
2874         FcPattern *match;
2875         FcResult result;
2876
2877         match = FcFontMatch(NULL, pattern, &result);
2878         if(!match)
2879                 return 1;
2880
2881         if(!(f->match = XftFontOpenPattern(xw.dpy, match))) {
2882                 FcPatternDestroy(match);
2883                 return 1;
2884         }
2885
2886         f->set = NULL;
2887         f->pattern = FcPatternDuplicate(pattern);
2888
2889         f->ascent = f->match->ascent;
2890         f->descent = f->match->descent;
2891         f->lbearing = 0;
2892         f->rbearing = f->match->max_advance_width;
2893
2894         f->height = f->ascent + f->descent;
2895         f->width = f->lbearing + f->rbearing;
2896
2897         return 0;
2898 }
2899
2900 void
2901 xloadfonts(char *fontstr, double fontsize) {
2902         FcPattern *pattern;
2903         FcResult r_sz, r_psz;
2904         double fontval;
2905
2906         if(fontstr[0] == '-') {
2907                 pattern = XftXlfdParse(fontstr, False, False);
2908         } else {
2909                 pattern = FcNameParse((FcChar8 *)fontstr);
2910         }
2911
2912         if(!pattern)
2913                 die("st: can't open font %s\n", fontstr);
2914
2915         if(fontsize > 0) {
2916                 FcPatternDel(pattern, FC_PIXEL_SIZE);
2917                 FcPatternDel(pattern, FC_SIZE);
2918                 FcPatternAddDouble(pattern, FC_PIXEL_SIZE, (double)fontsize);
2919                 usedfontsize = fontsize;
2920         } else {
2921                 r_psz = FcPatternGetDouble(pattern, FC_PIXEL_SIZE, 0, &fontval);
2922                 r_sz = FcPatternGetDouble(pattern, FC_SIZE, 0, &fontval);
2923                 if(r_psz == FcResultMatch) {
2924                         usedfontsize = fontval;
2925                 } else if(r_sz == FcResultMatch) {
2926                         usedfontsize = -1;
2927                 } else {
2928                         /*
2929                          * Default font size is 12, if none given. This is to
2930                          * have a known usedfontsize value.
2931                          */
2932                         FcPatternAddDouble(pattern, FC_PIXEL_SIZE, 12);
2933                         usedfontsize = 12;
2934                 }
2935         }
2936
2937         FcConfigSubstitute(0, pattern, FcMatchPattern);
2938         FcDefaultSubstitute(pattern);
2939
2940         if(xloadfont(&dc.font, pattern))
2941                 die("st: can't open font %s\n", fontstr);
2942
2943         if(usedfontsize < 0) {
2944                 FcPatternGetDouble(dc.font.match->pattern,
2945                                    FC_PIXEL_SIZE, 0, &fontval);
2946                 usedfontsize = fontval;
2947         }
2948
2949         /* Setting character width and height. */
2950         xw.cw = CEIL(dc.font.width * cwscale);
2951         xw.ch = CEIL(dc.font.height * chscale);
2952
2953         FcPatternDel(pattern, FC_SLANT);
2954         FcPatternAddInteger(pattern, FC_SLANT, FC_SLANT_ITALIC);
2955         if(xloadfont(&dc.ifont, pattern))
2956                 die("st: can't open font %s\n", fontstr);
2957
2958         FcPatternDel(pattern, FC_WEIGHT);
2959         FcPatternAddInteger(pattern, FC_WEIGHT, FC_WEIGHT_BOLD);
2960         if(xloadfont(&dc.ibfont, pattern))
2961                 die("st: can't open font %s\n", fontstr);
2962
2963         FcPatternDel(pattern, FC_SLANT);
2964         FcPatternAddInteger(pattern, FC_SLANT, FC_SLANT_ROMAN);
2965         if(xloadfont(&dc.bfont, pattern))
2966                 die("st: can't open font %s\n", fontstr);
2967
2968         FcPatternDestroy(pattern);
2969 }
2970
2971 int
2972 xloadfontset(Font *f) {
2973         FcResult result;
2974
2975         if(!(f->set = FcFontSort(0, f->pattern, FcTrue, 0, &result)))
2976                 return 1;
2977         return 0;
2978 }
2979
2980 void
2981 xunloadfont(Font *f) {
2982         XftFontClose(xw.dpy, f->match);
2983         FcPatternDestroy(f->pattern);
2984         if(f->set)
2985                 FcFontSetDestroy(f->set);
2986 }
2987
2988 void
2989 xunloadfonts(void) {
2990         /* Free the loaded fonts in the font cache.  */
2991         while(frclen > 0)
2992                 XftFontClose(xw.dpy, frc[--frclen].font);
2993
2994         xunloadfont(&dc.font);
2995         xunloadfont(&dc.bfont);
2996         xunloadfont(&dc.ifont);
2997         xunloadfont(&dc.ibfont);
2998 }
2999
3000 void
3001 xzoom(const Arg *arg) {
3002         xunloadfonts();
3003         xloadfonts(usedfont, usedfontsize + arg->i);
3004         cresize(0, 0);
3005         redraw(0);
3006 }
3007
3008 void
3009 xinit(void) {
3010         XGCValues gcvalues;
3011         Cursor cursor;
3012         Window parent;
3013         pid_t thispid = getpid();
3014
3015         if(!(xw.dpy = XOpenDisplay(NULL)))
3016                 die("Can't open display\n");
3017         xw.scr = XDefaultScreen(xw.dpy);
3018         xw.vis = XDefaultVisual(xw.dpy, xw.scr);
3019
3020         /* font */
3021         if(!FcInit())
3022                 die("Could not init fontconfig.\n");
3023
3024         usedfont = (opt_font == NULL)? font : opt_font;
3025         xloadfonts(usedfont, 0);
3026
3027         /* colors */
3028         xw.cmap = XDefaultColormap(xw.dpy, xw.scr);
3029         xloadcols();
3030
3031         /* adjust fixed window geometry */
3032         xw.w = 2 * borderpx + term.col * xw.cw;
3033         xw.h = 2 * borderpx + term.row * xw.ch;
3034         if(xw.gm & XNegative)
3035                 xw.l += DisplayWidth(xw.dpy, xw.scr) - xw.w - 2;
3036         if(xw.gm & YNegative)
3037                 xw.t += DisplayWidth(xw.dpy, xw.scr) - xw.h - 2;
3038
3039         /* Events */
3040         xw.attrs.background_pixel = dc.col[defaultbg].pixel;
3041         xw.attrs.border_pixel = dc.col[defaultbg].pixel;
3042         xw.attrs.bit_gravity = NorthWestGravity;
3043         xw.attrs.event_mask = FocusChangeMask | KeyPressMask
3044                 | ExposureMask | VisibilityChangeMask | StructureNotifyMask
3045                 | ButtonMotionMask | ButtonPressMask | ButtonReleaseMask;
3046         xw.attrs.colormap = xw.cmap;
3047
3048         parent = opt_embed ? strtol(opt_embed, NULL, 0) : \
3049                         XRootWindow(xw.dpy, xw.scr);
3050         xw.win = XCreateWindow(xw.dpy, parent, xw.l, xw.t,
3051                         xw.w, xw.h, 0, XDefaultDepth(xw.dpy, xw.scr), InputOutput,
3052                         xw.vis, CWBackPixel | CWBorderPixel | CWBitGravity
3053                         | CWEventMask | CWColormap, &xw.attrs);
3054
3055         memset(&gcvalues, 0, sizeof(gcvalues));
3056         gcvalues.graphics_exposures = False;
3057         dc.gc = XCreateGC(xw.dpy, parent, GCGraphicsExposures,
3058                         &gcvalues);
3059         xw.buf = XCreatePixmap(xw.dpy, xw.win, xw.w, xw.h,
3060                         DefaultDepth(xw.dpy, xw.scr));
3061         XSetForeground(xw.dpy, dc.gc, dc.col[defaultbg].pixel);
3062         XFillRectangle(xw.dpy, xw.buf, dc.gc, 0, 0, xw.w, xw.h);
3063
3064         /* Xft rendering context */
3065         xw.draw = XftDrawCreate(xw.dpy, xw.buf, xw.vis, xw.cmap);
3066
3067         /* input methods */
3068         if((xw.xim = XOpenIM(xw.dpy, NULL, NULL, NULL)) == NULL) {
3069                 XSetLocaleModifiers("@im=local");
3070                 if((xw.xim =  XOpenIM(xw.dpy, NULL, NULL, NULL)) == NULL) {
3071                         XSetLocaleModifiers("@im=");
3072                         if((xw.xim = XOpenIM(xw.dpy,
3073                                         NULL, NULL, NULL)) == NULL) {
3074                                 die("XOpenIM failed. Could not open input"
3075                                         " device.\n");
3076                         }
3077                 }
3078         }
3079         xw.xic = XCreateIC(xw.xim, XNInputStyle, XIMPreeditNothing
3080                                            | XIMStatusNothing, XNClientWindow, xw.win,
3081                                            XNFocusWindow, xw.win, NULL);
3082         if(xw.xic == NULL)
3083                 die("XCreateIC failed. Could not obtain input method.\n");
3084
3085         /* white cursor, black outline */
3086         cursor = XCreateFontCursor(xw.dpy, XC_xterm);
3087         XDefineCursor(xw.dpy, xw.win, cursor);
3088         XRecolorCursor(xw.dpy, cursor,
3089                 &(XColor){.red = 0xffff, .green = 0xffff, .blue = 0xffff},
3090                 &(XColor){.red = 0x0000, .green = 0x0000, .blue = 0x0000});
3091
3092         xw.xembed = XInternAtom(xw.dpy, "_XEMBED", False);
3093         xw.wmdeletewin = XInternAtom(xw.dpy, "WM_DELETE_WINDOW", False);
3094         xw.netwmname = XInternAtom(xw.dpy, "_NET_WM_NAME", False);
3095         XSetWMProtocols(xw.dpy, xw.win, &xw.wmdeletewin, 1);
3096
3097         xw.netwmpid = XInternAtom(xw.dpy, "_NET_WM_PID", False);
3098         XChangeProperty(xw.dpy, xw.win, xw.netwmpid, XA_CARDINAL, 32,
3099                         PropModeReplace, (uchar *)&thispid, 1);
3100
3101         xresettitle();
3102         XMapWindow(xw.dpy, xw.win);
3103         xhints();
3104         XSync(xw.dpy, False);
3105 }
3106
3107 void
3108 xdraws(char *s, Glyph base, int x, int y, int charlen, int bytelen) {
3109         int winx = borderpx + x * xw.cw, winy = borderpx + y * xw.ch,
3110             width = charlen * xw.cw, xp, i;
3111         int frcflags;
3112         int u8fl, u8fblen, u8cblen, doesexist;
3113         char *u8c, *u8fs;
3114         long unicodep;
3115         Font *font = &dc.font;
3116         FcResult fcres;
3117         FcPattern *fcpattern, *fontpattern;
3118         FcFontSet *fcsets[] = { NULL };
3119         FcCharSet *fccharset;
3120         Color *fg, *bg, *temp, revfg, revbg, truefg, truebg;
3121         XRenderColor colfg, colbg;
3122         XRectangle r;
3123         int oneatatime;
3124
3125         frcflags = FRC_NORMAL;
3126
3127         if(base.mode & ATTR_ITALIC) {
3128                 if(base.fg == defaultfg)
3129                         base.fg = defaultitalic;
3130                 font = &dc.ifont;
3131                 frcflags = FRC_ITALIC;
3132         } else if((base.mode & ATTR_ITALIC) && (base.mode & ATTR_BOLD)) {
3133                 if(base.fg == defaultfg)
3134                         base.fg = defaultitalic;
3135                 font = &dc.ibfont;
3136                 frcflags = FRC_ITALICBOLD;
3137         } else if(base.mode & ATTR_UNDERLINE) {
3138                 if(base.fg == defaultfg)
3139                         base.fg = defaultunderline;
3140         }
3141
3142         if(IS_TRUECOL(base.fg)) {
3143                 colfg.alpha = 0xffff;
3144                 colfg.red = TRUERED(base.fg);
3145                 colfg.green = TRUEGREEN(base.fg);
3146                 colfg.blue = TRUEBLUE(base.fg);
3147                 XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colfg, &truefg);
3148                 fg = &truefg;
3149         } else {
3150                 fg = &dc.col[base.fg];
3151         }
3152
3153         if(IS_TRUECOL(base.bg)) {
3154                 colbg.alpha = 0xffff;
3155                 colbg.green = TRUEGREEN(base.bg);
3156                 colbg.red = TRUERED(base.bg);
3157                 colbg.blue = TRUEBLUE(base.bg);
3158                 XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colbg, &truebg);
3159                 bg = &truebg;
3160         } else {
3161                 bg = &dc.col[base.bg];
3162         }
3163
3164         if(base.mode & ATTR_BOLD) {
3165                 /*
3166                  * change basic system colors [0-7]
3167                  * to bright system colors [8-15]
3168                  */
3169                 if(BETWEEN(base.fg, 0, 7))
3170                         fg = &dc.col[base.fg + 8];
3171
3172                 if(base.mode & ATTR_ITALIC) {
3173                         font = &dc.ibfont;
3174                         frcflags = FRC_ITALICBOLD;
3175                 } else {
3176                         font = &dc.bfont;
3177                         frcflags = FRC_BOLD;
3178                 }
3179         }
3180
3181         if(IS_SET(MODE_REVERSE)) {
3182                 if(fg == &dc.col[defaultfg]) {
3183                         fg = &dc.col[defaultbg];
3184                 } else {
3185                         colfg.red = ~fg->color.red;
3186                         colfg.green = ~fg->color.green;
3187                         colfg.blue = ~fg->color.blue;
3188                         colfg.alpha = fg->color.alpha;
3189                         XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colfg,
3190                                         &revfg);
3191                         fg = &revfg;
3192                 }
3193
3194                 if(bg == &dc.col[defaultbg]) {
3195                         bg = &dc.col[defaultfg];
3196                 } else {
3197                         colbg.red = ~bg->color.red;
3198                         colbg.green = ~bg->color.green;
3199                         colbg.blue = ~bg->color.blue;
3200                         colbg.alpha = bg->color.alpha;
3201                         XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colbg,
3202                                         &revbg);
3203                         bg = &revbg;
3204                 }
3205         }
3206
3207         if(base.mode & ATTR_REVERSE) {
3208                 temp = fg;
3209                 fg = bg;
3210                 bg = temp;
3211         }
3212
3213         if(base.mode & ATTR_BLINK && term.mode & MODE_BLINK)
3214                 fg = bg;
3215
3216         /* Intelligent cleaning up of the borders. */
3217         if(x == 0) {
3218                 xclear(0, (y == 0)? 0 : winy, borderpx,
3219                         winy + xw.ch + ((y >= term.row-1)? xw.h : 0));
3220         }
3221         if(x + charlen >= term.col) {
3222                 xclear(winx + width, (y == 0)? 0 : winy, xw.w,
3223                         ((y >= term.row-1)? xw.h : (winy + xw.ch)));
3224         }
3225         if(y == 0)
3226                 xclear(winx, 0, winx + width, borderpx);
3227         if(y == term.row-1)
3228                 xclear(winx, winy + xw.ch, winx + width, xw.h);
3229
3230         /* Clean up the region we want to draw to. */
3231         XftDrawRect(xw.draw, bg, winx, winy, width, xw.ch);
3232
3233         /* Set the clip region because Xft is sometimes dirty. */
3234         r.x = 0;
3235         r.y = 0;
3236         r.height = xw.ch;
3237         r.width = width;
3238         XftDrawSetClipRectangles(xw.draw, winx, winy, &r, 1);
3239
3240         for(xp = winx; bytelen > 0;) {
3241                 /*
3242                  * Search for the range in the to be printed string of glyphs
3243                  * that are in the main font. Then print that range. If
3244                  * some glyph is found that is not in the font, do the
3245                  * fallback dance.
3246                  */
3247                 u8fs = s;
3248                 u8fblen = 0;
3249                 u8fl = 0;
3250                 oneatatime = font->width != xw.cw;
3251                 for(;;) {
3252                         u8c = s;
3253                         u8cblen = utf8decode(s, &unicodep, UTF_SIZ);
3254                         s += u8cblen;
3255                         bytelen -= u8cblen;
3256
3257                         doesexist = XftCharExists(xw.dpy, font->match, unicodep);
3258                         if(oneatatime || !doesexist || bytelen <= 0) {
3259                                 if(oneatatime || bytelen <= 0) {
3260                                         if(doesexist) {
3261                                                 u8fl++;
3262                                                 u8fblen += u8cblen;
3263                                         }
3264                                 }
3265
3266                                 if(u8fl > 0) {
3267                                         XftDrawStringUtf8(xw.draw, fg,
3268                                                         font->match, xp,
3269                                                         winy + font->ascent,
3270                                                         (FcChar8 *)u8fs,
3271                                                         u8fblen);
3272                                         xp += xw.cw * u8fl;
3273
3274                                 }
3275                                 break;
3276                         }
3277
3278                         u8fl++;
3279                         u8fblen += u8cblen;
3280                 }
3281                 if(doesexist) {
3282                         if(oneatatime)
3283                                 continue;
3284                         break;
3285                 }
3286
3287                 /* Search the font cache. */
3288                 for(i = 0; i < frclen; i++) {
3289                         if(XftCharExists(xw.dpy, frc[i].font, unicodep)
3290                                         && frc[i].flags == frcflags) {
3291                                 break;
3292                         }
3293                 }
3294
3295                 /* Nothing was found. */
3296                 if(i >= frclen) {
3297                         if(!font->set)
3298                                 xloadfontset(font);
3299                         fcsets[0] = font->set;
3300
3301                         /*
3302                          * Nothing was found in the cache. Now use
3303                          * some dozen of Fontconfig calls to get the
3304                          * font for one single character.
3305                          *
3306                          * Xft and fontconfig are design failures.
3307                          */
3308                         fcpattern = FcPatternDuplicate(font->pattern);
3309                         fccharset = FcCharSetCreate();
3310
3311                         FcCharSetAddChar(fccharset, unicodep);
3312                         FcPatternAddCharSet(fcpattern, FC_CHARSET,
3313                                         fccharset);
3314                         FcPatternAddBool(fcpattern, FC_SCALABLE,
3315                                         FcTrue);
3316
3317                         FcConfigSubstitute(0, fcpattern,
3318                                         FcMatchPattern);
3319                         FcDefaultSubstitute(fcpattern);
3320
3321                         fontpattern = FcFontSetMatch(0, fcsets,
3322                                         FcTrue, fcpattern, &fcres);
3323
3324                         /*
3325                          * Overwrite or create the new cache entry.
3326                          */
3327                         if(frclen >= LEN(frc)) {
3328                                 frclen = LEN(frc) - 1;
3329                                 XftFontClose(xw.dpy, frc[frclen].font);
3330                         }
3331
3332                         frc[frclen].font = XftFontOpenPattern(xw.dpy,
3333                                         fontpattern);
3334                         frc[frclen].flags = frcflags;
3335
3336                         i = frclen;
3337                         frclen++;
3338
3339                         FcPatternDestroy(fcpattern);
3340                         FcCharSetDestroy(fccharset);
3341                 }
3342
3343                 XftDrawStringUtf8(xw.draw, fg, frc[i].font,
3344                                 xp, winy + frc[i].font->ascent,
3345                                 (FcChar8 *)u8c, u8cblen);
3346
3347                 xp += xw.cw * wcwidth(unicodep);
3348         }
3349
3350         /*
3351          * This is how the loop above actually should be. Why does the
3352          * application have to care about font details?
3353          *
3354          * I have to repeat: Xft and Fontconfig are design failures.
3355          */
3356         /*
3357         XftDrawStringUtf8(xw.draw, fg, font->set, winx,
3358                         winy + font->ascent, (FcChar8 *)s, bytelen);
3359         */
3360
3361         if(base.mode & ATTR_UNDERLINE) {
3362                 XftDrawRect(xw.draw, fg, winx, winy + font->ascent + 1,
3363                                 width, 1);
3364         }
3365
3366         /* Reset clip to none. */
3367         XftDrawSetClip(xw.draw, 0);
3368 }
3369
3370 void
3371 xdrawcursor(void) {
3372         static int oldx = 0, oldy = 0;
3373         int sl, width, curx;
3374         Glyph g = {{' '}, ATTR_NULL, defaultbg, defaultcs};
3375
3376         LIMIT(oldx, 0, term.col-1);
3377         LIMIT(oldy, 0, term.row-1);
3378
3379         curx = term.c.x;
3380
3381         /* adjust position if in dummy */
3382         if(term.line[oldy][oldx].mode & ATTR_WDUMMY)
3383                 oldx--;
3384         if(term.line[term.c.y][curx].mode & ATTR_WDUMMY)
3385                 curx--;
3386
3387         memcpy(g.c, term.line[term.c.y][term.c.x].c, UTF_SIZ);
3388
3389         /* remove the old cursor */
3390         sl = utf8len(term.line[oldy][oldx].c);
3391         width = (term.line[oldy][oldx].mode & ATTR_WIDE)? 2 : 1;
3392         xdraws(term.line[oldy][oldx].c, term.line[oldy][oldx], oldx,
3393                         oldy, width, sl);
3394
3395         /* draw the new one */
3396         if(!(IS_SET(MODE_HIDE))) {
3397                 if(xw.state & WIN_FOCUSED) {
3398                         if(IS_SET(MODE_REVERSE)) {
3399                                 g.mode |= ATTR_REVERSE;
3400                                 g.fg = defaultcs;
3401                                 g.bg = defaultfg;
3402                         }
3403
3404                         sl = utf8len(g.c);
3405                         width = (term.line[term.c.y][curx].mode & ATTR_WIDE)\
3406                                 ? 2 : 1;
3407                         xdraws(g.c, g, term.c.x, term.c.y, width, sl);
3408                 } else {
3409                         XftDrawRect(xw.draw, &dc.col[defaultcs],
3410                                         borderpx + curx * xw.cw,
3411                                         borderpx + term.c.y * xw.ch,
3412                                         xw.cw - 1, 1);
3413                         XftDrawRect(xw.draw, &dc.col[defaultcs],
3414                                         borderpx + curx * xw.cw,
3415                                         borderpx + term.c.y * xw.ch,
3416                                         1, xw.ch - 1);
3417                         XftDrawRect(xw.draw, &dc.col[defaultcs],
3418                                         borderpx + (curx + 1) * xw.cw - 1,
3419                                         borderpx + term.c.y * xw.ch,
3420                                         1, xw.ch - 1);
3421                         XftDrawRect(xw.draw, &dc.col[defaultcs],
3422                                         borderpx + curx * xw.cw,
3423                                         borderpx + (term.c.y + 1) * xw.ch - 1,
3424                                         xw.cw, 1);
3425                 }
3426                 oldx = curx, oldy = term.c.y;
3427         }
3428 }
3429
3430
3431 void
3432 xsettitle(char *p) {
3433         XTextProperty prop;
3434
3435         Xutf8TextListToTextProperty(xw.dpy, &p, 1, XUTF8StringStyle,
3436                         &prop);
3437         XSetWMName(xw.dpy, xw.win, &prop);
3438         XSetTextProperty(xw.dpy, xw.win, &prop, xw.netwmname);
3439         XFree(prop.value);
3440 }
3441
3442 void
3443 xresettitle(void) {
3444         xsettitle(opt_title ? opt_title : "st");
3445 }
3446
3447 void
3448 redraw(int timeout) {
3449         struct timespec tv = {0, timeout * 1000};
3450
3451         tfulldirt();
3452         draw();
3453
3454         if(timeout > 0) {
3455                 nanosleep(&tv, NULL);
3456                 XSync(xw.dpy, False); /* necessary for a good tput flash */
3457         }
3458 }
3459
3460 void
3461 draw(void) {
3462         drawregion(0, 0, term.col, term.row);
3463         XCopyArea(xw.dpy, xw.buf, xw.win, dc.gc, 0, 0, xw.w,
3464                         xw.h, 0, 0);
3465         XSetForeground(xw.dpy, dc.gc,
3466                         dc.col[IS_SET(MODE_REVERSE)?
3467                                 defaultfg : defaultbg].pixel);
3468 }
3469
3470 void
3471 drawregion(int x1, int y1, int x2, int y2) {
3472         int ic, ib, x, y, ox, sl;
3473         Glyph base, new;
3474         char buf[DRAW_BUF_SIZ];
3475         bool ena_sel = sel.ob.x != -1 && sel.alt == IS_SET(MODE_ALTSCREEN);
3476         long unicodep;
3477
3478         if(!(xw.state & WIN_VISIBLE))
3479                 return;
3480
3481         for(y = y1; y < y2; y++) {
3482                 if(!term.dirty[y])
3483                         continue;
3484
3485                 xtermclear(0, y, term.col, y);
3486                 term.dirty[y] = 0;
3487                 base = term.line[y][0];
3488                 ic = ib = ox = 0;
3489                 for(x = x1; x < x2; x++) {
3490                         new = term.line[y][x];
3491                         if(new.mode == ATTR_WDUMMY)
3492                                 continue;
3493                         if(ena_sel && selected(x, y))
3494                                 new.mode ^= ATTR_REVERSE;
3495                         if(ib > 0 && (ATTRCMP(base, new)
3496                                         || ib >= DRAW_BUF_SIZ-UTF_SIZ)) {
3497                                 xdraws(buf, base, ox, y, ic, ib);
3498                                 ic = ib = 0;
3499                         }
3500                         if(ib == 0) {
3501                                 ox = x;
3502                                 base = new;
3503                         }
3504
3505                         sl = utf8decode(new.c, &unicodep, UTF_SIZ);
3506                         memcpy(buf+ib, new.c, sl);
3507                         ib += sl;
3508                         ic += (new.mode & ATTR_WIDE)? 2 : 1;
3509                 }
3510                 if(ib > 0)
3511                         xdraws(buf, base, ox, y, ic, ib);
3512         }
3513         xdrawcursor();
3514 }
3515
3516 void
3517 expose(XEvent *ev) {
3518         XExposeEvent *e = &ev->xexpose;
3519
3520         if(xw.state & WIN_REDRAW) {
3521                 if(!e->count)
3522                         xw.state &= ~WIN_REDRAW;
3523         }
3524         redraw(0);
3525 }
3526
3527 void
3528 visibility(XEvent *ev) {
3529         XVisibilityEvent *e = &ev->xvisibility;
3530
3531         if(e->state == VisibilityFullyObscured) {
3532                 xw.state &= ~WIN_VISIBLE;
3533         } else if(!(xw.state & WIN_VISIBLE)) {
3534                 /* need a full redraw for next Expose, not just a buf copy */
3535                 xw.state |= WIN_VISIBLE | WIN_REDRAW;
3536         }
3537 }
3538
3539 void
3540 unmap(XEvent *ev) {
3541         xw.state &= ~WIN_VISIBLE;
3542 }
3543
3544 void
3545 xsetpointermotion(int set) {
3546         MODBIT(xw.attrs.event_mask, set, PointerMotionMask);
3547         XChangeWindowAttributes(xw.dpy, xw.win, CWEventMask, &xw.attrs);
3548 }
3549
3550 void
3551 xseturgency(int add) {
3552         XWMHints *h = XGetWMHints(xw.dpy, xw.win);
3553
3554         MODBIT(h->flags, add, XUrgencyHint);
3555         XSetWMHints(xw.dpy, xw.win, h);
3556         XFree(h);
3557 }
3558
3559 void
3560 focus(XEvent *ev) {
3561         XFocusChangeEvent *e = &ev->xfocus;
3562
3563         if(e->mode == NotifyGrab)
3564                 return;
3565
3566         if(ev->type == FocusIn) {
3567                 XSetICFocus(xw.xic);
3568                 xw.state |= WIN_FOCUSED;
3569                 xseturgency(0);
3570                 if(IS_SET(MODE_FOCUS))
3571                         ttywrite("\033[I", 3);
3572         } else {
3573                 XUnsetICFocus(xw.xic);
3574                 xw.state &= ~WIN_FOCUSED;
3575                 if(IS_SET(MODE_FOCUS))
3576                         ttywrite("\033[O", 3);
3577         }
3578 }
3579
3580 static inline bool
3581 match(uint mask, uint state) {
3582         return mask == XK_ANY_MOD || mask == (state & ~ignoremod);
3583 }
3584
3585 void
3586 numlock(const Arg *dummy) {
3587         term.numlock ^= 1;
3588 }
3589
3590 char*
3591 kmap(KeySym k, uint state) {
3592         Key *kp;
3593         int i;
3594
3595         /* Check for mapped keys out of X11 function keys. */
3596         for(i = 0; i < LEN(mappedkeys); i++) {
3597                 if(mappedkeys[i] == k)
3598                         break;
3599         }
3600         if(i == LEN(mappedkeys)) {
3601                 if((k & 0xFFFF) < 0xFD00)
3602                         return NULL;
3603         }
3604
3605         for(kp = key; kp < key + LEN(key); kp++) {
3606                 if(kp->k != k)
3607                         continue;
3608
3609                 if(!match(kp->mask, state))
3610                         continue;
3611
3612                 if(IS_SET(MODE_APPKEYPAD) ? kp->appkey < 0 : kp->appkey > 0)
3613                         continue;
3614                 if(term.numlock && kp->appkey == 2)
3615                         continue;
3616
3617                 if(IS_SET(MODE_APPCURSOR) ? kp->appcursor < 0 : kp->appcursor > 0)
3618                         continue;
3619
3620                 if(IS_SET(MODE_CRLF) ? kp->crlf < 0 : kp->crlf > 0)
3621                         continue;
3622
3623                 return kp->s;
3624         }
3625
3626         return NULL;
3627 }
3628
3629 void
3630 kpress(XEvent *ev) {
3631         XKeyEvent *e = &ev->xkey;
3632         KeySym ksym;
3633         char buf[32], *customkey;
3634         int len;
3635         long c;
3636         Status status;
3637         Shortcut *bp;
3638
3639         if(IS_SET(MODE_KBDLOCK))
3640                 return;
3641
3642         len = XmbLookupString(xw.xic, e, buf, sizeof buf, &ksym, &status);
3643         /* 1. shortcuts */
3644         for(bp = shortcuts; bp < shortcuts + LEN(shortcuts); bp++) {
3645                 if(ksym == bp->keysym && match(bp->mod, e->state)) {
3646                         bp->func(&(bp->arg));
3647                         return;
3648                 }
3649         }
3650
3651         /* 2. custom keys from config.h */
3652         if((customkey = kmap(ksym, e->state))) {
3653                 ttysend(customkey, strlen(customkey));
3654                 return;
3655         }
3656
3657         /* 3. composed string from input method */
3658         if(len == 0)
3659                 return;
3660         if(len == 1 && e->state & Mod1Mask) {
3661                 if(IS_SET(MODE_8BIT)) {
3662                         if(*buf < 0177) {
3663                                 c = *buf | 0x80;
3664                                 len = utf8encode(c, buf, UTF_SIZ);
3665                         }
3666                 } else {
3667                         buf[1] = buf[0];
3668                         buf[0] = '\033';
3669                         len = 2;
3670                 }
3671         }
3672         ttysend(buf, len);
3673 }
3674
3675
3676 void
3677 cmessage(XEvent *e) {
3678         /*
3679          * See xembed specs
3680          *  http://standards.freedesktop.org/xembed-spec/xembed-spec-latest.html
3681          */
3682         if(e->xclient.message_type == xw.xembed && e->xclient.format == 32) {
3683                 if(e->xclient.data.l[1] == XEMBED_FOCUS_IN) {
3684                         xw.state |= WIN_FOCUSED;
3685                         xseturgency(0);
3686                 } else if(e->xclient.data.l[1] == XEMBED_FOCUS_OUT) {
3687                         xw.state &= ~WIN_FOCUSED;
3688                 }
3689         } else if(e->xclient.data.l[0] == xw.wmdeletewin) {
3690                 /* Send SIGHUP to shell */
3691                 kill(pid, SIGHUP);
3692                 exit(EXIT_SUCCESS);
3693         }
3694 }
3695
3696 void
3697 cresize(int width, int height) {
3698         int col, row;
3699
3700         if(width != 0)
3701                 xw.w = width;
3702         if(height != 0)
3703                 xw.h = height;
3704
3705         col = (xw.w - 2 * borderpx) / xw.cw;
3706         row = (xw.h - 2 * borderpx) / xw.ch;
3707
3708         tresize(col, row);
3709         xresize(col, row);
3710         ttyresize();
3711 }
3712
3713 void
3714 resize(XEvent *e) {
3715         if(e->xconfigure.width == xw.w && e->xconfigure.height == xw.h)
3716                 return;
3717
3718         cresize(e->xconfigure.width, e->xconfigure.height);
3719 }
3720
3721 void
3722 run(void) {
3723         XEvent ev;
3724         int w = xw.w, h = xw.h;
3725         fd_set rfd;
3726         int xfd = XConnectionNumber(xw.dpy), xev, blinkset = 0, dodraw = 0;
3727         struct timeval drawtimeout, *tv = NULL, now, last, lastblink;
3728
3729         /* Waiting for window mapping */
3730         while(1) {
3731                 XNextEvent(xw.dpy, &ev);
3732                 if(ev.type == ConfigureNotify) {
3733                         w = ev.xconfigure.width;
3734                         h = ev.xconfigure.height;
3735                 } else if(ev.type == MapNotify) {
3736                         break;
3737                 }
3738         }
3739
3740         ttynew();
3741         cresize(w, h);
3742
3743         gettimeofday(&last, NULL);
3744         lastblink = last;
3745
3746         for(xev = actionfps;;) {
3747                 long deltatime;
3748
3749                 FD_ZERO(&rfd);
3750                 FD_SET(cmdfd, &rfd);
3751                 FD_SET(xfd, &rfd);
3752
3753                 if(select(MAX(xfd, cmdfd)+1, &rfd, NULL, NULL, tv) < 0) {
3754                         if(errno == EINTR)
3755                                 continue;
3756                         die("select failed: %s\n", strerror(errno));
3757                 }
3758                 if(FD_ISSET(cmdfd, &rfd)) {
3759                         ttyread();
3760                         if(blinktimeout) {
3761                                 blinkset = tattrset(ATTR_BLINK);
3762                                 if(!blinkset)
3763                                         MODBIT(term.mode, 0, MODE_BLINK);
3764                         }
3765                 }
3766
3767                 if(FD_ISSET(xfd, &rfd))
3768                         xev = actionfps;
3769
3770                 gettimeofday(&now, NULL);
3771                 drawtimeout.tv_sec = 0;
3772                 drawtimeout.tv_usec = (1000/xfps) * 1000;
3773                 tv = &drawtimeout;
3774
3775                 dodraw = 0;
3776                 if(blinktimeout && TIMEDIFF(now, lastblink) > blinktimeout) {
3777                         tsetdirtattr(ATTR_BLINK);
3778                         term.mode ^= MODE_BLINK;
3779                         lastblink = now;
3780                         dodraw = 1;
3781                 }
3782                 deltatime = TIMEDIFF(now, last);
3783                 if(deltatime > (xev? (1000/xfps) : (1000/actionfps))
3784                                 || deltatime < 0) {
3785                         dodraw = 1;
3786                         last = now;
3787                 }
3788
3789                 if(dodraw) {
3790                         while(XPending(xw.dpy)) {
3791                                 XNextEvent(xw.dpy, &ev);
3792                                 if(XFilterEvent(&ev, None))
3793                                         continue;
3794                                 if(handler[ev.type])
3795                                         (handler[ev.type])(&ev);
3796                         }
3797
3798                         draw();
3799                         XFlush(xw.dpy);
3800
3801                         if(xev && !FD_ISSET(xfd, &rfd))
3802                                 xev--;
3803                         if(!FD_ISSET(cmdfd, &rfd) && !FD_ISSET(xfd, &rfd)) {
3804                                 if(blinkset) {
3805                                         if(TIMEDIFF(now, lastblink) \
3806                                                         > blinktimeout) {
3807                                                 drawtimeout.tv_usec = 1;
3808                                         } else {
3809                                                 drawtimeout.tv_usec = (1000 * \
3810                                                         (blinktimeout - \
3811                                                         TIMEDIFF(now,
3812                                                                 lastblink)));
3813                                         }
3814                                 } else {
3815                                         tv = NULL;
3816                                 }
3817                         }
3818                 }
3819         }
3820 }
3821
3822 void
3823 usage(void) {
3824         die("%s " VERSION " (c) 2010-2014 st engineers\n" \
3825         "usage: st [-a] [-v] [-c class] [-f font] [-g geometry] [-o file]" \
3826         " [-t title] [-w windowid] [-e command ...]\n", argv0);
3827 }
3828
3829 int
3830 main(int argc, char *argv[]) {
3831         char *titles;
3832         uint cols = 80, rows = 24;
3833
3834         xw.l = xw.t = 0;
3835         xw.isfixed = False;
3836
3837         ARGBEGIN {
3838         case 'a':
3839                 allowaltscreen = false;
3840                 break;
3841         case 'c':
3842                 opt_class = EARGF(usage());
3843                 break;
3844         case 'e':
3845                 /* eat all remaining arguments */
3846                 if(argc > 1) {
3847                         opt_cmd = &argv[1];
3848                         if(argv[1] != NULL && opt_title == NULL) {
3849                                 titles = xstrdup(argv[1]);
3850                                 opt_title = basename(titles);
3851                         }
3852                 }
3853                 goto run;
3854         case 'f':
3855                 opt_font = EARGF(usage());
3856                 break;
3857         case 'g':
3858                 xw.gm = XParseGeometry(EARGF(usage()),
3859                                 &xw.l, &xw.t, &cols, &rows);
3860                 break;
3861         case 'i':
3862                 xw.isfixed = True;
3863                 break;
3864         case 'o':
3865                 opt_io = EARGF(usage());
3866                 break;
3867         case 't':
3868                 opt_title = EARGF(usage());
3869                 break;
3870         case 'w':
3871                 opt_embed = EARGF(usage());
3872                 break;
3873         case 'v':
3874         default:
3875                 usage();
3876         } ARGEND;
3877
3878 run:
3879         setlocale(LC_CTYPE, "");
3880         XSetLocaleModifiers("");
3881         tnew(cols? cols : 1, rows? rows : 1);
3882         xinit();
3883         selinit();
3884         run();
3885
3886         return 0;
3887 }
3888